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</style><table class="infobox"><caption class="infobox-title" style="padding-bottom:0.15em;">Solar System</caption><tbody><tr><td colspan="2" class="infobox-image"><div class="infobox-caption"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0; padding:2px 0 4px 0;">The <a href="Sun" title="Sun">Sun</a>, <a href="Planets_of_the_solar_system" class="mw-redirect" title="Planets of the solar system">planets, moons and dwarf planets</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup><br>(true color, size to scale, distances not to scale)</div></div></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Age</th><td class="infobox-data">4.568 billion years<sup id="cite_ref-AgeSolarSystem_2-0" class="reference"><a href="#cite_note-AgeSolarSystem-2"><span class="cite-bracket">[</span>b<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Location</th><td class="infobox-data"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><style data-mw-deduplicate="TemplateStyles:r1126788409">
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</style><div class="plainlist"><ul><li><span class="nowrap"><a href="Local_Interstellar_Cloud" title="Local Interstellar Cloud">Local Interstellar Cloud</a></span></li><li><a href="Local_Bubble" title="Local Bubble">Local Bubble</a><sup id="cite_ref-JPL_interstellar_3-0" class="reference"><a href="#cite_note-JPL_interstellar-3"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li><li><a href="Orion%E2%80%93Cygnus_Arm" class="mw-redirect" title="Orion–Cygnus Arm">Orion–Cygnus Arm</a></li><li><a href="Milky_Way" title="Milky Way">Milky Way</a><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li></ul></div></div></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Nearest star</th><td class="infobox-data"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><div class="plainlist"><ul><li><a href="Proxima_Centauri" title="Proxima Centauri">Proxima Centauri</a></li><li> (4.2465 <a href="Light-year" title="Light-year">ly</a>)<sup id="cite_ref-lurie2014_5-0" class="reference"><a href="#cite_note-lurie2014-5"><span class="cite-bracket">[</span>D 1<span class="cite-bracket">]</span></a></sup></li><li><a href="Alpha_Centauri" title="Alpha Centauri">Alpha Centauri</a></li><li> (4.36 ly)<sup id="cite_ref-RECONS_6-0" class="reference"><a href="#cite_note-RECONS-6"><span class="cite-bracket">[</span>D 2<span class="cite-bracket">]</span></a></sup></li></ul></div></div></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#efefef">Population</th></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Stars</th><td class="infobox-data"><a href="Sun" title="Sun">Sun</a></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Planets</th><td class="infobox-data"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><div class="plainlist">
<ul><li><a href="Mercury_(planet)" title="Mercury (planet)">Mercury</a></li>
<li><a href="Venus" title="Venus">Venus</a></li>
<li><a href="Earth" title="Earth">Earth</a></li>
<li><a href="Mars" title="Mars">Mars</a></li>
<li><a href="Jupiter" title="Jupiter">Jupiter</a></li>
<li><a href="Saturn" title="Saturn">Saturn</a></li>
<li><a href="Uranus" title="Uranus">Uranus</a></li>
<li><a href="Neptune" title="Neptune">Neptune</a></li></ul>
</div></div></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Known <a href="Dwarf_planet" title="Dwarf planet">dwarf planets</a></th><td class="infobox-data"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><div class="plainlist">
<ul><li><a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></li>
<li><a href="Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a></li>
<li><a href="Pluto" title="Pluto">Pluto</a></li>
<li><a href="Haumea" title="Haumea">Haumea</a></li>
<li><a href="Quaoar" title="Quaoar">Quaoar</a></li>
<li><a href="Makemake" title="Makemake">Makemake</a></li>
<li><a href="Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a></li>
<li><a href="Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a></li>
<li><a href="Sedna_(dwarf_planet)" title="Sedna (dwarf planet)">Sedna</a></li>
<li> <a href="List_of_possible_dwarf_planets" title="List of possible dwarf planets"><i>more candidates...</i></a></li></ul>
</div></div></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Known <a href="Natural_satellite" title="Natural satellite">natural satellites</a></th><td class="infobox-data">758<sup id="cite_ref-JPLbodies_7-0" class="reference"><a href="#cite_note-JPLbodies-7"><span class="cite-bracket">[</span>D 3<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Known <a href="Minor_planet" title="Minor planet">minor planets</a></th><td class="infobox-data">1,368,528<sup id="cite_ref-MPCSummary_8-0" class="reference"><a href="#cite_note-MPCSummary-8"><span class="cite-bracket">[</span>D 4<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Known <a href="Comet" title="Comet">comets</a></th><td class="infobox-data">4,591<sup id="cite_ref-MPCSummary_8-1" class="reference"><a href="#cite_note-MPCSummary-8"><span class="cite-bracket">[</span>D 4<span class="cite-bracket">]</span></a></sup></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#efefef">Planetary system</th></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Stellar_classification" title="Stellar classification">Star spectral type</a></th><td class="infobox-data"><a href="G-type_main-sequence_star" title="G-type main-sequence star">G2V</a></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Frost_line_(astrophysics)" title="Frost line (astrophysics)">Frost line</a></th><td class="infobox-data"><span class="nowrap">~5 AU</span><sup id="cite_ref-Mumma_12-0" class="reference"><a href="#cite_note-Mumma-12"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Semi-major_axis" class="mw-redirect" title="Semi-major axis">Semi-major axis</a> of outermost planet</th><td class="infobox-data">30.07 AU<sup id="cite_ref-Horizons_9-0" class="reference"><a href="#cite_note-Horizons-9"><span class="cite-bracket">[</span>D 5<span class="cite-bracket">]</span></a></sup> (<style data-mw-deduplicate="TemplateStyles:r886047488">
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</style><span class="nobold"><a href="Neptune" title="Neptune">Neptune</a></span>)</td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Kuiper_cliff" class="mw-redirect" title="Kuiper cliff">Kuiper cliff</a></th><td class="infobox-data">50–70 AU<sup id="cite_ref-twotino_10-0" class="reference"><a href="#cite_note-twotino-10"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-KuiperGap_11-0" class="reference"><a href="#cite_note-KuiperGap-11"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Heliopause_(astronomy)" class="mw-redirect" title="Heliopause (astronomy)">Heliopause</a></th><td class="infobox-data">detected at 120 AU<sup id="cite_ref-heliopause_13-0" class="reference"><a href="#cite_note-heliopause-13"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Hill_sphere" title="Hill sphere">Hill sphere</a></th><td class="infobox-data">1.1 pc (230,000 AU)<sup id="cite_ref-Chebotarev_14-0" class="reference"><a href="#cite_note-Chebotarev-14"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> – 0.865 pc (178,419 AU)<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></td></tr><tr><th colspan="2" class="infobox-header" style="background-color:#efefef">Orbit about <a href="Galactic_Center" title="Galactic Center">Galactic Center</a></th></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;"><a href="Invariable_plane" title="Invariable plane">Invariable</a>-to-<a href="Galactic_plane" title="Galactic plane">galactic plane</a> inclination</th><td class="infobox-data">~60°, to the ecliptic<sup id="cite_ref-angle_16-0" class="reference"><a href="#cite_note-angle-16"><span class="cite-bracket">[</span>c<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Distance to<br>Galactic Center</th><td class="infobox-data"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">24,000–28,000 ly</div><sup id="cite_ref-francis14_17-0" class="reference"><a href="#cite_note-francis14-17"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Orbital speed</th><td class="infobox-data"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">720,000 km/h (450,000 mi/h)<sup id="cite_ref-roughfactsofthesun_18-0" class="reference"><a href="#cite_note-roughfactsofthesun-18"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup></div></td></tr><tr><th scope="row" class="infobox-label" style="padding:0.2em 0.5em 0 0.1em;line-height:1.2em;">Orbital period</th><td class="infobox-data">~230 <a href="Million_year" class="mw-redirect" title="Million year">million years</a><sup id="cite_ref-roughfactsofthesun_18-1" class="reference"><a href="#cite_note-roughfactsofthesun-18"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup></td></tr></tbody></table>
<p>The <b>Solar System</b><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>d<span class="cite-bracket">]</span></a></sup> consists of the Sun and the objects that <a href="Orbit" title="Orbit">orbit</a> it.<sup id="cite_ref-IAU_Office_of_Astronomy_for_Education_y607_20-0" class="reference"><a href="#cite_note-IAU_Office_of_Astronomy_for_Education_y607-20"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> The name comes from <i>Sōl</i>, the Latin name for the <a href="Sun" title="Sun">Sun</a>.<sup id="cite_ref-k349_21-0" class="reference"><a href="#cite_note-k349-21"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> It <a href="Formation_and_evolution_of_the_Solar_System" title="Formation and evolution of the Solar System">formed about 4.6 billion years ago</a> when a dense region of a <a href="Molecular_cloud" title="Molecular cloud">molecular cloud</a> collapsed, creating the Sun and a <a href="Protoplanetary_disc" class="mw-redirect" title="Protoplanetary disc">protoplanetary disc</a> from which the orbiting bodies assembled. The <a href="Thermonuclear_fusion" class="mw-redirect" title="Thermonuclear fusion">fusion</a> of hydrogen into helium inside the Sun's <a href="Stellar_core" title="Stellar core">core</a> releases energy, which is primarily emitted through its outer <a href="Photosphere" title="Photosphere">photosphere</a>. This creates a decreasing temperature <a href="Gradient" title="Gradient">gradient</a> across the system. Over 99.86% of the Solar System's mass is located within the Sun.
</p><p>The <a href="List_of_Solar_System_objects_by_size" title="List of Solar System objects by size">most massive objects that orbit the Sun</a> are the eight <a href="Planet" title="Planet">planets</a>. Closest to the Sun in order of increasing distance are the four <a href="Terrestrial_planet" title="Terrestrial planet">terrestrial planets</a> – <a href="Mercury_(planet)" title="Mercury (planet)">Mercury</a>, <a href="Venus" title="Venus">Venus</a>, <a href="Earth" title="Earth">Earth</a> and <a href="Mars" title="Mars">Mars</a>. Only the Earth and Mars orbit within the Sun's <a href="Habitable_zone" title="Habitable zone">habitable zone</a>, where liquid water can exist on the surface. Beyond the <a href="Frost_line_(astrophysics)" title="Frost line (astrophysics)">frost line</a> at about five <a href="Astronomical_unit" title="Astronomical unit">astronomical units</a> (AU),<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>e<span class="cite-bracket">]</span></a></sup> are two <a href="Gas_giant" title="Gas giant">gas giants</a> – <a href="Jupiter" title="Jupiter">Jupiter</a> and <a href="Saturn" title="Saturn">Saturn</a> – and two <a href="Ice_giant" title="Ice giant">ice giants</a> – <a href="Uranus" title="Uranus">Uranus</a> and <a href="Neptune" title="Neptune">Neptune</a>. Jupiter and Saturn possess nearly 90% of the non-stellar mass of the Solar System.
</p><p>There are a vast number of less massive objects. There is a strong consensus among astronomers that the Solar System has at least nine <a href="Dwarf_planet" title="Dwarf planet">dwarf planets</a>: <a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a>, <a href="Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a>, <a href="Pluto" title="Pluto">Pluto</a>, <a href="Haumea" title="Haumea">Haumea</a>, <a href="Quaoar" title="Quaoar">Quaoar</a>, <a href="Makemake" title="Makemake">Makemake</a>, <a href="Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a>, <a href="Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a>, and <a href="Sedna_(dwarf_planet)" title="Sedna (dwarf planet)">Sedna</a>.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>f<span class="cite-bracket">]</span></a></sup> Six planets, seven dwarf planets, and other bodies have orbiting <a href="Natural_satellite" title="Natural satellite">natural satellites</a>, which are commonly called 'moons', and range from <a href="Planetary-mass_moon" title="Planetary-mass moon">sizes of dwarf planets</a>, like Earth's <a href="Moon" title="Moon">Moon</a>, to <a href="Moonlet" title="Moonlet">moonlets</a>. There are <a href="Small_Solar_System_body" title="Small Solar System body">small Solar System bodies</a>, such as <a href="Asteroid" title="Asteroid">asteroids</a>, <a href="Comet" title="Comet">comets</a>, <a href="Centaur_(minor_planet)" class="mw-redirect" title="Centaur (minor planet)">centaurs</a>, <a href="Meteoroid" title="Meteoroid">meteoroids</a>, and <a href="Interplanetary_dust_cloud" title="Interplanetary dust cloud">interplanetary dust clouds</a>. Some of these bodies are in the <a href="Asteroid_belt" title="Asteroid belt">asteroid belt</a> (between Mars's and Jupiter's orbit) and the <a href="Kuiper_belt" title="Kuiper belt">Kuiper belt</a> (just outside Neptune's orbit).<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>g<span class="cite-bracket">]</span></a></sup>
</p><p>Between the bodies of the Solar System is an <a href="Interplanetary_medium" title="Interplanetary medium">interplanetary medium</a> of dust and particles. The Solar System is constantly flooded by outflowing <a href="Charged_particle" title="Charged particle">charged particles</a> from the <a href="Solar_wind" title="Solar wind">solar wind</a>, forming the <a href="Heliosphere" title="Heliosphere">heliosphere</a>. At around <span class="nowrap">70–90 AU</span> from the Sun, the solar wind is halted by the <a href="Interstellar_medium" title="Interstellar medium">interstellar medium</a>, resulting in the <a href="Heliopause_(astronomy)" class="mw-redirect" title="Heliopause (astronomy)">heliopause</a>. This is the boundary to <a href="Interstellar_space" class="mw-redirect" title="Interstellar space">interstellar space</a>. The Solar System extends beyond this boundary with its outermost region, the theorized <a href="Oort_cloud" title="Oort cloud">Oort cloud</a>, the source for <a href="Long-period_comet" class="mw-redirect" title="Long-period comet">long-period comets</a>, extending to a radius of <span class="nowrap">2,000–200,000 AU</span>. The Solar System currently moves through a cloud of interstellar medium called the <a href="Local_Cloud" class="mw-redirect" title="Local Cloud">Local Cloud</a>. The <a href="List_of_nearest_stars" title="List of nearest stars">closest star</a> to the Solar System, <a href="Proxima_Centauri" title="Proxima Centauri">Proxima Centauri</a>, is 4.25 <a href="Light-year" title="Light-year">light-years</a> (269,000 AU) away. Both are within the <a href="Local_Bubble" title="Local Bubble">Local Bubble</a>, a relatively small 1,000 light-years wide region of the <a href="Milky_Way" title="Milky Way">Milky Way</a>.
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<div class="mw-heading mw-heading2"><h2 id="Definition">Definition</h2></div>
<p>The Solar System includes the Sun and all objects that are bound to it by gravity and orbit it.<sup id="cite_ref-x579_26-0" class="reference"><a href="#cite_note-x579-26"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-l783_27-0" class="reference"><a href="#cite_note-l783-27"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-n787_28-0" class="reference"><a href="#cite_note-n787-28"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup>
</p><p>The <a href="International_Astronomical_Union" title="International Astronomical Union">International Astronomical Union</a> describes the Solar System as all objects that are bound by the gravity of the Sun, the Sun itself, its eight planets, and the other celestial bodies which orbit it.<sup id="cite_ref-IAU_Office_of_Astronomy_for_Education_y607_20-1" class="reference"><a href="#cite_note-IAU_Office_of_Astronomy_for_Education_y607-20"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> <a href="NASA" title="NASA">NASA</a> describes the Solar System as a <a href="Planetary_system" title="Planetary system">planetary system</a>, including the Sun and all objects that orbit it.<sup id="cite_ref-k349_21-1" class="reference"><a href="#cite_note-k349-21"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>
</p><p>When not used as a proper noun and written without capitalization, "solar system" may refer to either the Solar System itself or any system reminiscent of the Solar System.<sup id="cite_ref-x579_26-1" class="reference"><a href="#cite_note-x579-26"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="Formation_and_evolution">Formation and evolution</h2></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Formation_and_evolution_of_the_Solar_System" title="Formation and evolution of the Solar System">Formation and evolution of the Solar System</a></div>
<div class="mw-heading mw-heading3"><h3 id="Past">Past</h3></div>
<p>The Solar System formed at least 4.568 billion years ago from the gravitational collapse of a region within a large <a href="Molecular_cloud" title="Molecular cloud">molecular cloud</a>.<sup id="cite_ref-AgeSolarSystem_2-1" class="reference"><a href="#cite_note-AgeSolarSystem-2"><span class="cite-bracket">[</span>b<span class="cite-bracket">]</span></a></sup> This initial cloud was likely several light-years across and probably birthed several stars.<sup id="cite_ref-Arizona_30-0" class="reference"><a href="#cite_note-Arizona-30"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> As is typical of molecular clouds, this one consisted mostly of hydrogen, with some helium, and small amounts of heavier elements <a href="Nuclear_fusion" title="Nuclear fusion">fused</a> by previous generations of stars.<sup id="cite_ref-:3_31-0" class="reference"><a href="#cite_note-:3-31"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup>
</p><p>As the <a href="Presolar_nebula" class="mw-redirect" title="Presolar nebula">pre-solar nebula</a><sup id="cite_ref-:3_31-1" class="reference"><a href="#cite_note-:3-31"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> collapsed, <a href="Conservation_of_angular_momentum" class="mw-redirect" title="Conservation of angular momentum">conservation of angular momentum</a> caused it to rotate faster. The center, where most of the mass collected, became increasingly hotter than the surroundings.<sup id="cite_ref-Arizona_30-1" class="reference"><a href="#cite_note-Arizona-30"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> As the contracting nebula spun faster, it began to flatten into a <a href="Protoplanetary_disc" class="mw-redirect" title="Protoplanetary disc">protoplanetary disc</a> with a diameter of roughly <span class="nowrap">200 AU</span><sup id="cite_ref-Arizona_30-2" class="reference"><a href="#cite_note-Arizona-30"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> and a hot, dense <a href="Protostar" title="Protostar">protostar</a> at the center.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> The planets formed by <a href="Accretion_(astrophysics)" title="Accretion (astrophysics)">accretion</a> from this disc,<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> in which dust and gas gravitationally attracted each other, coalescing to form ever larger bodies. Hundreds of protoplanets may have existed in the early Solar System, but they either merged or were destroyed or ejected, leaving the planets, dwarf planets, and leftover <a href="Small_Solar_System_body" title="Small Solar System body">minor bodies</a>.<sup id="cite_ref-bennett_8.2_36-0" class="reference"><a href="#cite_note-bennett_8.2-36"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup>
</p><p>Due to their higher boiling points, only metals and silicates could exist in solid form in the warm inner Solar System close to the Sun (within the <a href="Frost_line_(astrophysics)" title="Frost line (astrophysics)">frost line</a>). They eventually formed the rocky planets of Mercury, Venus, Earth, and Mars. Because these <a href="Refractory_(planetary_science)" title="Refractory (planetary science)">refractory</a> materials only comprised a small fraction of the solar nebula, the terrestrial planets could not grow very large.<sup id="cite_ref-bennett_8.2_36-1" class="reference"><a href="#cite_note-bennett_8.2-36"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup>
</p><p>The giant planets (Jupiter, Saturn, Uranus, and Neptune) formed further out, beyond the frost line, the point between the orbits of Mars and Jupiter where material is cool enough for <a href="Volatile_(astrogeology)" title="Volatile (astrogeology)">volatile</a> icy compounds to remain solid. The ices that formed these planets were more plentiful than the metals and silicates that formed the terrestrial inner planets, allowing them to grow massive enough to capture large atmospheres of hydrogen and helium, the lightest and most abundant elements.<sup id="cite_ref-bennett_8.2_36-2" class="reference"><a href="#cite_note-bennett_8.2-36"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> Leftover debris that never became planets congregated in regions such as the asteroid belt, Kuiper belt, and Oort cloud.<sup id="cite_ref-bennett_8.2_36-3" class="reference"><a href="#cite_note-bennett_8.2-36"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup>
</p><p>Within 50 million years, the pressure and density of hydrogen in the center of the protostar became great enough for it to begin <a href="Nuclear_fusion" title="Nuclear fusion">thermonuclear fusion</a>.<sup id="cite_ref-Yi2001_38-0" class="reference"><a href="#cite_note-Yi2001-38"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> As helium accumulates at its core, the Sun is growing brighter;<sup id="cite_ref-:4_39-0" class="reference"><a href="#cite_note-:4-39"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> early in its main-sequence life its brightness was 70% that of what it is today.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> The temperature, <a href="Nuclear_reaction_rate" class="mw-redirect" title="Nuclear reaction rate">reaction rate</a>, pressure, and density increased until <a href="Hydrostatic_equilibrium" title="Hydrostatic equilibrium">hydrostatic equilibrium</a> was achieved: the thermal pressure counterbalancing the force of gravity. At this point, the Sun became a <a href="Main_sequence" title="Main sequence">main-sequence</a> star.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> Solar wind from the Sun created the <a href="Heliosphere" title="Heliosphere">heliosphere</a> and swept away the remaining gas and dust from the protoplanetary disc into interstellar space.<sup id="cite_ref-:4_39-1" class="reference"><a href="#cite_note-:4-39"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup>
</p><p>Following the dissipation of the <a href="Protoplanetary_disk" title="Protoplanetary disk">protoplanetary disk</a>, the <a href="Nice_model" title="Nice model">Nice model</a> proposes that <a href="Gravity_assist" title="Gravity assist">gravitational encounters</a> between planetisimals and the gas giants caused each to <a href="Planetary_migration" title="Planetary migration">migrate</a> into different orbits. This led to dynamical instability of the entire system, which scattered the planetisimals and ultimately placed the gas giants in their current positions. During this period, the <a href="Grand_tack_hypothesis" title="Grand tack hypothesis">grand tack hypothesis</a> suggests that a final inward migration of Jupiter dispersed much of the asteroid belt, leading to the <a href="Late_Heavy_Bombardment" title="Late Heavy Bombardment">Late Heavy Bombardment</a> of the inner planets.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Present_and_future">Present and future</h3></div>
<p>The Solar System remains in a relatively stable, slowly evolving state by following isolated, <a href="Gravitationally_bound" class="mw-redirect" title="Gravitationally bound">gravitationally bound</a> orbits around the Sun.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> Although the Solar System has been fairly stable for billions of years, it is technically <a href="Chaotic_system" class="mw-redirect" title="Chaotic system">chaotic</a>, and may <a href="Stability_of_the_Solar_System" title="Stability of the Solar System">eventually be disrupted</a>. There is a small chance that another star will pass through the Solar System in the next few billion years. Although this could destabilize the system and eventually lead millions of years later to expulsion of planets, collisions of planets, or planets hitting the Sun, it would most likely leave the Solar System much as it is today.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup>
</p>
<p>The Sun's main-sequence phase, from beginning to end, will last about 10 billion years for the Sun compared to around two billion years for all other subsequent phases of the Sun's pre-<a href="Stellar_remnant" class="mw-redirect" title="Stellar remnant">remnant</a> life combined.<sup id="cite_ref-mnras386_1_46-0" class="reference"><a href="#cite_note-mnras386_1-46"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> The Solar System will remain roughly as it is known today until the hydrogen in the core of the Sun has been entirely converted to helium, which will occur roughly 5 billion years from now. This will mark the end of the Sun's main-sequence life. At that time, the core of the Sun will contract with hydrogen fusion occurring along a shell surrounding the inert helium, and the energy output will be greater than at present. The outer layers of the Sun will expand to roughly 260 times its current diameter, and the Sun will become a <a href="Red_giant" title="Red giant">red giant</a>. Because of its increased surface area, the surface of the Sun will be cooler (2,600 K (4,220 °F) at its coolest) than it is on the main sequence.<sup id="cite_ref-mnras386_1_46-1" class="reference"><a href="#cite_note-mnras386_1-46"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup>
</p><p>The expanding Sun is expected to vaporize Mercury as well as Venus, and render Earth and Mars uninhabitable (possibly destroying Earth as well).<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> Eventually, the core will be hot enough for helium fusion; the Sun will burn helium for a fraction of the time it burned hydrogen in the core. The Sun is not massive enough to commence the fusion of heavier elements, and nuclear reactions in the core will dwindle. Its outer layers will be ejected into space, leaving behind a dense <a href="White_dwarf" title="White dwarf">white dwarf</a>, half the original mass of the Sun but only the size of Earth.<sup id="cite_ref-mnras386_1_46-2" class="reference"><a href="#cite_note-mnras386_1-46"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> The ejected outer layers may form a <a href="Planetary_nebula" title="Planetary nebula">planetary nebula</a>, returning some of the material that formed the Sun – but now enriched with <a href="Metallicity" title="Metallicity">heavier elements</a> like carbon – to the <a href="Interstellar_medium" title="Interstellar medium">interstellar medium</a>.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="General_characteristics">General characteristics</h2></div>
<p>Astronomers sometimes divide the Solar System structure into separate regions. The <a href="Inner_Solar_System" class="mw-redirect" title="Inner Solar System">inner Solar System</a> includes Mercury, Venus, Earth, Mars, and the bodies in the <a href="Asteroid_belt" title="Asteroid belt">asteroid belt</a>. The <a href="Outer_Solar_System" class="mw-redirect" title="Outer Solar System">outer Solar System</a> includes Jupiter, Saturn, Uranus, Neptune, and the bodies in the <a href="Kuiper_belt" title="Kuiper belt">Kuiper belt</a>.<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> Since the discovery of the Kuiper belt, the outermost parts of the Solar System are considered a distinct region consisting of <a href="Trans-Neptunian_object" title="Trans-Neptunian object">the objects beyond Neptune</a>.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Composition">Composition</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Further information: <a href="List_of_Solar_System_objects" title="List of Solar System objects">List of Solar System objects</a> and <a href="List_of_interstellar_and_circumstellar_molecules" title="List of interstellar and circumstellar molecules">List of interstellar and circumstellar molecules</a></div>
<p>The principal component of the Solar System is the Sun, a <a href="G-type_main-sequence_star" title="G-type main-sequence star">G-type main-sequence star</a> that contains 99.86% of the system's known mass and dominates it gravitationally.<sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> The Sun's four largest orbiting bodies, the giant planets, account for 99% of the remaining mass, with Jupiter and Saturn together comprising more than 90%. The remaining objects of the Solar System (including the four terrestrial planets, the dwarf planets, moons, <a href="Asteroid" title="Asteroid">asteroids</a>, and comets) together comprise less than 0.002% of the Solar System's total mass.<sup id="cite_ref-footnoteD_57-0" class="reference"><a href="#cite_note-footnoteD-57"><span class="cite-bracket">[</span>h<span class="cite-bracket">]</span></a></sup>
</p><p>The Sun is composed of roughly 98% hydrogen and helium,<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> as are Jupiter and Saturn.<sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Williams-Jupiter_60-0" class="reference"><a href="#cite_note-Williams-Jupiter-60"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> A composition gradient exists in the Solar System, created by heat and <a href="Light_pressure" class="mw-redirect" title="Light pressure">light pressure</a> from the early Sun; those objects closer to the Sun, which are more affected by heat and light pressure, are composed of elements with high melting points. Objects farther from the Sun are composed largely of materials with lower melting points.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> The boundary in the Solar System beyond which those volatile substances could coalesce is known as the <a href="Frost_line_(astrophysics)" title="Frost line (astrophysics)">frost line</a>, and it lies at roughly five times the Earth's distance from the Sun.<sup id="cite_ref-Mumma_12-1" class="reference"><a href="#cite_note-Mumma-12"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Orbits">Orbits</h3></div>
<p>The planets and other large objects in orbit around the Sun lie near the <a href="Invariable_plane#Solar_System" title="Invariable plane">invariable plane of the Solar System</a>, as does Earth's orbit, known as the <a href="Ecliptic" title="Ecliptic">ecliptic</a>, and most closely the orbit of Jupiter, with an inclination to it of 0.3219°.<sup id="cite_ref-j770_62-0" class="reference"><a href="#cite_note-j770-62"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> Smaller icy objects such as comets frequently orbit at significantly greater angles to this plane.<sup id="cite_ref-Levison2003_63-0" class="reference"><a href="#cite_note-Levison2003-63"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> Most of the planets in the Solar System have secondary systems of their own, being orbited by natural satellites called moons. All of the largest natural satellites are in <a href="Synchronous_rotation" class="mw-redirect" title="Synchronous rotation">synchronous rotation</a>, with one face permanently turned toward their parent. The four giant planets have planetary rings, thin discs of tiny particles that orbit them in unison.<sup id="cite_ref-bennett_4.5_65-0" class="reference"><a href="#cite_note-bennett_4.5-65"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup>
</p><p>As a result of the <a href="Formation_and_evolution_of_the_Solar_System" title="Formation and evolution of the Solar System">formation of the Solar System</a>, planets and most other objects orbit the Sun in the same direction that the Sun is rotating. That is, counter-clockwise, as viewed from above Earth's north pole.<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> There are exceptions, such as <a href="Halley's_Comet" title="Halley's Comet">Halley's Comet</a>.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> Most of the larger moons orbit their planets in <a href="Retrograde_and_prograde_motion" title="Retrograde and prograde motion">prograde</a> direction, matching the direction of planetary rotation; Neptune's moon <a href="Triton_(moon)" title="Triton (moon)">Triton</a> is the largest to orbit in the opposite, retrograde manner.<sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> Most larger objects rotate around their own axes in the prograde direction relative to their orbit, though the rotation of Venus is retrograde.<sup id="cite_ref-69" class="reference"><a href="#cite_note-69"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup>
</p><p>To a good first approximation, <a href="Kepler's_laws_of_planetary_motion" title="Kepler's laws of planetary motion">Kepler's laws of planetary motion</a> describe the orbits of objects around the Sun.<sup id="cite_ref-:0_70-0" class="reference"><a href="#cite_note-:0-70"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Pages: 433–437">: 433–437 </span></sup> These laws stipulate that each object travels along an <a href="Ellipse" title="Ellipse">ellipse</a> with the Sun at one <a href="Focus_(geometry)" title="Focus (geometry)">focus</a>, which causes the body's distance from the Sun to vary over the course of its year. A body's closest approach to the Sun is called its <i><a href="Perihelion" class="mw-redirect" title="Perihelion">perihelion</a></i>, whereas its most distant point from the Sun is called its <i><a href="Aphelion" class="mw-redirect" title="Aphelion">aphelion</a></i>.<sup id="cite_ref-:8_71-0" class="reference"><a href="#cite_note-:8-71"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Location: 9-6">: 9-6 </span></sup> With the exception of Mercury, the orbits of the planets are nearly circular, but many comets, asteroids, and Kuiper belt objects follow highly elliptical orbits. Kepler's laws only account for the influence of the Sun's gravity upon an orbiting body, not the gravitational pulls of different bodies upon each other. On a human time scale, these perturbations can be accounted for using <a href="Numerical_model_of_the_Solar_System" title="Numerical model of the Solar System">numerical models</a>,<sup id="cite_ref-:8_71-1" class="reference"><a href="#cite_note-:8-71"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Location: 9-6">: 9-6 </span></sup> but the planetary system can change chaotically over billions of years.<sup id="cite_ref-72" class="reference"><a href="#cite_note-72"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup>
</p><p>The <a href="Angular_momentum" title="Angular momentum">angular momentum</a> of the Solar System is a measure of the total amount of orbital and <a href="Rotational_momentum" class="mw-redirect" title="Rotational momentum">rotational momentum</a> possessed by all its moving components.<sup id="cite_ref-73" class="reference"><a href="#cite_note-73"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> Although the Sun dominates the system by mass, it accounts for only about 2% of the angular momentum.<sup id="cite_ref-Marochnik1995_74-0" class="reference"><a href="#cite_note-Marochnik1995-74"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-75" class="reference"><a href="#cite_note-75"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> The planets, dominated by Jupiter, account for most of the rest of the angular momentum due to the combination of their mass, orbit, and distance from the Sun, with a possibly significant contribution from comets.<sup id="cite_ref-Marochnik1995_74-1" class="reference"><a href="#cite_note-Marochnik1995-74"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Distances_and_scales">Distances and scales</h3></div>
<p>The radius of the Sun is 0.0047 AU (700,000 km; 400,000 mi).<sup id="cite_ref-arxiv1203_4898_76-0" class="reference"><a href="#cite_note-arxiv1203_4898-76"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> Thus, the Sun occupies 0.00001% (1 part in 10<sup>7</sup>) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10<sup>−6</sup>) that of the Sun. Jupiter, the largest planet, is <span class="nowrap">5.2 AU</span> from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is <span class="nowrap">30 AU</span> from the Sun.<sup id="cite_ref-Williams-Jupiter_60-1" class="reference"><a href="#cite_note-Williams-Jupiter-60"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup>
</p><p>With a few exceptions, the farther a planet or belt is from the Sun, the larger the distance between its orbit and the orbit of the next nearest object to the Sun. For example, Venus is approximately 0.33 AU farther out from the Sun than Mercury, whereas Saturn is 4.3 AU out from Jupiter, and Neptune lies 10.5 AU out from Uranus. Attempts have been made to determine a relationship between these orbital distances, like the <a href="Titius%E2%80%93Bode_law" title="Titius–Bode law">Titius–Bode law</a><sup id="cite_ref-78" class="reference"><a href="#cite_note-78"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> and <a href="Mysterium_Cosmographicum" title="Mysterium Cosmographicum">Johannes Kepler's model</a> based on the <a href="Platonic_solid" title="Platonic solid">Platonic solids</a>,<sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> but ongoing discoveries have invalidated these hypotheses.<sup id="cite_ref-Boss_80-0" class="reference"><a href="#cite_note-Boss-80"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup>
</p><p>Some <a href="Solar_System_model" title="Solar System model">Solar System models</a> attempt to convey the relative scales involved in the Solar System in human terms. Some are small in scale (and may be mechanical – called <a href="Orrery" title="Orrery">orreries</a>) – whereas others extend across cities or regional areas.<sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> The largest such scale model, the <a href="Sweden_Solar_System" title="Sweden Solar System">Sweden Solar System</a>, uses the 110-meter (361-foot) <a href="Avicii_Arena" title="Avicii Arena">Avicii Arena</a> in Stockholm as its substitute Sun, and, following the scale, Jupiter is a 7.5-meter (25-foot) sphere at <a href="Stockholm_Arlanda_Airport" title="Stockholm Arlanda Airport">Stockholm Arlanda Airport</a>, 40 km (25 mi) away, whereas the farthest current object, <a href="90377_Sedna" class="mw-redirect" title="90377 Sedna">Sedna</a>, is a 10 cm (4 in) sphere in <a href="Lule%C3%A5" title="Luleå">Luleå</a>, 912 km (567 mi) away.<sup id="cite_ref-82" class="reference"><a href="#cite_note-82"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Sedna_83-0" class="reference"><a href="#cite_note-Sedna-83"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup> At that scale, the distance to Proxima Centauri would be roughly 8 times further than the Moon is from Earth.
</p><p>If the Sun–Neptune distance is scaled to 100 metres (330 ft), then the Sun would be about 3 cm (1.2 in) in diameter (roughly two-thirds the diameter of a golf ball), the giant planets would be all smaller than about 3 mm (0.12 in), and <a href="Earth's_diameter" class="mw-redirect" title="Earth's diameter">Earth's diameter</a> along with that of the other terrestrial planets would be smaller than a <a href="Flea" title="Flea">flea</a> (0.3 mm or 0.012 in) at this scale.<sup id="cite_ref-84" class="reference"><a href="#cite_note-84"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Habitability">Habitability</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Planetary_habitability_in_the_Solar_System" title="Planetary habitability in the Solar System">Planetary habitability in the Solar System</a></div>
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</style><div class="thumb tmulti tright"><div class="thumbinner multiimageinner" style="width:342px;max-width:342px"><div class="trow"><div class="tsingle" style="width:340px;max-width:340px"><div class="thumbimage" style="height:190px;overflow:hidden"><span typeof="mw:File"></span></div><div class="thumbcaption">Comparison of the habitable zones of the Solar System and <a href="TRAPPIST-1" title="TRAPPIST-1">TRAPPIST-1</a>, an ultracool red dwarf star known to have seven terrestrial planets in stable orbits around the star.</div></div></div><div class="trow"><div class="tsingle" style="width:340px;max-width:340px"><div class="thumbimage" style="height:197px;overflow:hidden"><span typeof="mw:File"></span></div><div class="thumbcaption">Comparison of the <a href="Habitable_zone" title="Habitable zone">habitable zones</a> for different stellar temperatures, with a sample of known exoplanets plus the Earth, Mars, and Venus. From top to bottom are an <a href="F-type_main-sequence_star" title="F-type main-sequence star">F-type main-sequence star</a>, a <a href="G-type_main-sequence_star" title="G-type main-sequence star">yellow dwarf</a> (G-type main-sequence star), an <a href="Orange_dwarf" class="mw-redirect" title="Orange dwarf">orange dwarf</a> (K-type main-sequence star), a typical <a href="Red_dwarf" title="Red dwarf">red dwarf</a>, and an <a href="Ultra-cool_dwarf" title="Ultra-cool dwarf">ultra-cool dwarf</a>.</div></div></div></div></div>
<p>Besides solar energy, the primary characteristic of the Solar System enabling the presence of life is the heliosphere and planetary magnetic fields (for those planets that have them). These magnetic fields partially shield the Solar System from high-energy interstellar particles called <a href="Cosmic_ray" title="Cosmic ray">cosmic rays</a>. The density of cosmic rays in the <a href="Interstellar_medium" title="Interstellar medium">interstellar medium</a> and the strength of the Sun's magnetic field change on very long timescales, so the level of cosmic-ray penetration in the Solar System varies, though by how much is unknown.<sup id="cite_ref-Langner_et_al_2005_85-0" class="reference"><a href="#cite_note-Langner_et_al_2005-85"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup>
</p><p>The <a href="Circumstellar_habitable_zone" class="mw-redirect" title="Circumstellar habitable zone">zone of habitability</a> of the Solar System is conventionally located in the inner Solar System, where planetary surface or atmospheric temperatures admit the possibility of <a href="Liquid_water" class="mw-redirect" title="Liquid water">liquid water</a>.<sup id="cite_ref-NASA-20150407_86-0" class="reference"><a href="#cite_note-NASA-20150407-86"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup> Habitability might be possible in <a href="Subsurface_ocean" class="mw-redirect" title="Subsurface ocean">subsurface oceans</a> of various outer Solar System moons.<sup id="cite_ref-87" class="reference"><a href="#cite_note-87"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Comparison_with_extrasolar_systems">Comparison with extrasolar systems</h3></div>
<p>Compared to many extrasolar systems, the Solar System stands out in lacking planets interior to the orbit of Mercury.<sup id="cite_ref-Martin082015_88-0" class="reference"><a href="#cite_note-Martin082015-88"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-89" class="reference"><a href="#cite_note-89"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> The known Solar System lacks <a href="Super-Earth" title="Super-Earth">super-Earths</a>, planets between one and ten times as massive as the Earth,<sup id="cite_ref-Martin082015_88-1" class="reference"><a href="#cite_note-Martin082015-88"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> although the hypothetical <a href="Planet_Nine" title="Planet Nine">Planet Nine</a>, if it does exist, could be a super-Earth orbiting in the edge of the Solar System.<sup id="cite_ref-90" class="reference"><a href="#cite_note-90"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup>
</p><p>Uncommonly, it has only small terrestrial and large gas giants; elsewhere planets of intermediate size are typical – both rocky and gas – so there is no "gap" as seen between the size of Earth and of Neptune (with a radius 3.8 times as large). As many of these super-Earths are closer to their respective stars than Mercury is to the Sun, a hypothesis has arisen that all planetary systems start with many close-in planets, and that typically a sequence of their collisions causes consolidation of mass into few larger planets, but in case of the Solar System the collisions caused their destruction and ejection.<sup id="cite_ref-Martin082015_88-2" class="reference"><a href="#cite_note-Martin082015-88"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-91" class="reference"><a href="#cite_note-91"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup>
</p><p>The orbits of Solar System planets are nearly circular. Compared to many other systems, they have smaller <a href="Orbital_eccentricity" title="Orbital eccentricity">orbital eccentricity</a>.<sup id="cite_ref-Martin082015_88-3" class="reference"><a href="#cite_note-Martin082015-88"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> Although there are attempts to explain it partly with a bias in the <a href="Doppler_spectroscopy" title="Doppler spectroscopy">radial-velocity detection method</a> and partly with long interactions of a quite high number of planets, the exact causes remain undetermined.<sup id="cite_ref-Martin082015_88-4" class="reference"><a href="#cite_note-Martin082015-88"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-92" class="reference"><a href="#cite_note-92"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Sun">Sun</h2></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Sun" title="Sun">Sun</a></div>
<p>The Sun is the Solar System's star and by far its most massive component. Its large mass (332,900 <a href="Earth_mass" title="Earth mass">Earth masses</a>),<sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup> which comprises 99.86% of all the mass in the Solar System,<sup id="cite_ref-Woolfson00_94-0" class="reference"><a href="#cite_note-Woolfson00-94"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> produces temperatures and densities in its <a href="Solar_core" title="Solar core">core</a> high enough to sustain nuclear fusion of hydrogen into helium.<sup id="cite_ref-95" class="reference"><a href="#cite_note-95"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> This releases an enormous amount of <a href="Energy" title="Energy">energy</a>, mostly <a href="Radiant_energy" title="Radiant energy">radiated</a> into <a href="Outer_space" title="Outer space">space</a> as <a href="Electromagnetic_radiation" title="Electromagnetic radiation">electromagnetic radiation</a> peaking in <a href="Visible_light" class="mw-redirect" title="Visible light">visible light</a>.<sup id="cite_ref-96" class="reference"><a href="#cite_note-96"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-97" class="reference"><a href="#cite_note-97"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup>
</p><p>Because the Sun fuses hydrogen at its core, it is a main-sequence star. More specifically, it is a <a href="G-type_main-sequence_star" title="G-type main-sequence star">G2-type main-sequence star</a>, where the type designation refers to its <a href="Effective_temperature" title="Effective temperature">effective temperature</a>. Hotter main-sequence stars are more luminous but shorter lived. The Sun's temperature is intermediate between that of the <a href="O-type_main-sequence_star" title="O-type main-sequence star">hottest stars</a> and that of the coolest stars. Stars brighter and hotter than the Sun are rare, whereas substantially dimmer and cooler stars, known as <a href="Red_dwarf" title="Red dwarf">red dwarfs</a>, make up about 75% of the <a href="Fusor_(astronomy)" title="Fusor (astronomy)">fusor</a> stars in the <a href="Milky_Way" title="Milky Way">Milky Way</a>.<sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup>
</p><p>The Sun is a <a href="Population_I_stars" class="mw-redirect" title="Population I stars">population I star</a>, having formed in the <a href="Spiral_arm" title="Spiral arm">spiral arms</a> of the <a href="Milky_Way" title="Milky Way">Milky Way</a> galaxy. It has a higher abundance of elements heavier than hydrogen and helium ("<a href="Metallicity" title="Metallicity">metals</a>" in astronomical parlance) than the older population II stars in the <a href="Galactic_bulge" title="Galactic bulge">galactic bulge</a> and <a href="Galactic_halo" title="Galactic halo">halo</a>.<sup id="cite_ref-99" class="reference"><a href="#cite_note-99"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> Elements heavier than hydrogen and helium were formed in the cores of ancient and exploding stars, so the first generation of stars had to die before the <a href="Universe" title="Universe">universe</a> could be enriched with these atoms. The oldest stars contain few metals, whereas stars born later have more. This higher metallicity is thought to have been crucial to the Sun's development of a <a href="Planetary_system" title="Planetary system">planetary system</a> because the planets formed from the accretion of "metals".<sup id="cite_ref-100" class="reference"><a href="#cite_note-100"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup>
</p><p>The region of space dominated by the Solar <a href="Magnetosphere" title="Magnetosphere">magnetosphere</a> is the <a href="Heliosphere" title="Heliosphere">heliosphere</a>, which spans much of the Solar System. Along with <a href="Sunlight" title="Sunlight">light</a>, the Sun radiates a continuous stream of charged particles (a <a href="Plasma_(physics)" title="Plasma (physics)">plasma</a>) called the <a href="Solar_wind" title="Solar wind">solar wind</a>. This stream spreads outwards at speeds from 900,000 kilometres per hour (560,000 mph) to 2,880,000 kilometres per hour (1,790,000 mph),<sup id="cite_ref-101" class="reference"><a href="#cite_note-101"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup> filling the vacuum between the bodies of the Solar System. The result is a <a href="Vacuum" title="Vacuum">thin</a>, dusty atmosphere, called the <a href="Interplanetary_medium" title="Interplanetary medium">interplanetary medium</a>, which extends to at least <span class="nowrap">100 AU</span>.<sup id="cite_ref-Voyager_102-0" class="reference"><a href="#cite_note-Voyager-102"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup>
</p><p>Activity on the Sun's surface, such as <a href="Solar_flare" title="Solar flare">solar flares</a> and <a href="Coronal_mass_ejection" title="Coronal mass ejection">coronal mass ejections</a>, disturbs the heliosphere, creating <a href="Space_weather" title="Space weather">space weather</a> and causing <a href="Geomagnetic_storm" title="Geomagnetic storm">geomagnetic storms</a>.<sup id="cite_ref-SunFlip_103-0" class="reference"><a href="#cite_note-SunFlip-103"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup> Coronal mass ejections and similar events blow a magnetic field and huge quantities of material from the surface of the Sun. The interaction of this magnetic field and material with Earth's magnetic field funnels charged particles into Earth's upper atmosphere, where its interactions create <a href="Aurora_(astronomy)" class="mw-redirect" title="Aurora (astronomy)">aurorae</a> seen near the <a href="Earth's_magnetic_field#Magnetic_poles" title="Earth's magnetic field">magnetic poles</a>.<sup id="cite_ref-104" class="reference"><a href="#cite_note-104"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> The largest stable structure within the heliosphere is the <a href="Heliospheric_current_sheet" title="Heliospheric current sheet">heliospheric current sheet</a>, a spiral form created by the actions of the Sun's rotating magnetic field on the interplanetary medium.<sup id="cite_ref-105" class="reference"><a href="#cite_note-105"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-106" class="reference"><a href="#cite_note-106"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Inner_Solar_System">Inner Solar System</h2></div>
<p>The inner Solar System is the region comprising the <a href="#Terrestrial_planets">terrestrial planets</a> and the <a href="Asteroid" title="Asteroid">asteroids</a>.<sup id="cite_ref-107" class="reference"><a href="#cite_note-107"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup> Composed mainly of <a href="Silicate" title="Silicate">silicates</a> and metals,<sup id="cite_ref-108" class="reference"><a href="#cite_note-108"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup> the objects of the inner Solar System are relatively close to the Sun; the radius of this entire region is less than the distance between the orbits of Jupiter and Saturn. This region is within the <a href="Frost_line_(astrophysics)" title="Frost line (astrophysics)">frost line</a>, which is a little less than <span class="nowrap">5 AU</span> from the Sun.<sup id="cite_ref-Levison2003_63-1" class="reference"><a href="#cite_note-Levison2003-63"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Inner_planets">Inner planets</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Terrestrial_planet" title="Terrestrial planet">Terrestrial planet</a></div>
<p>The four terrestrial or inner planets have dense, rocky compositions, few or no <a href="Natural_satellite" title="Natural satellite">moons</a>, and no <a href="Planetary_ring" class="mw-redirect" title="Planetary ring">ring systems</a>. They are composed largely of <a href="Refractory_(planetary_science)" title="Refractory (planetary science)">refractory</a> minerals such as <a href="Silicates" class="mw-redirect" title="Silicates">silicates</a>—which form their <a href="Crust_(geology)" title="Crust (geology)">crusts</a> and <a href="Mantle_(geology)" title="Mantle (geology)">mantles</a>—and metals such as iron and nickel which form their <a href="Planetary_core" title="Planetary core">cores</a>. Three of the four inner planets (Venus, Earth, and Mars) have <a href="Atmosphere" title="Atmosphere">atmospheres</a> substantial enough to generate weather; all have impact craters and <a href="Tectonics" title="Tectonics">tectonic</a> surface features, such as <a href="Rift_valley" title="Rift valley">rift valleys</a> and volcanoes.<sup id="cite_ref-Ryden_109-0" class="reference"><a href="#cite_note-Ryden-109"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup>
</p>
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</style><span class="vanchor"><span class="vanchor-text"><a href="Mercury_(planet)" title="Mercury (planet)">Mercury</a></span></span> (0.31–0.59 AU from the Sun)<sup id="cite_ref-nasa-factsheet_110-0" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> is the smallest planet in the Solar System. Its surface is grayish, with an expansive <a href="Rupes" title="Rupes">rupes</a> (cliff) system generated from <a href="Thrust_fault" title="Thrust fault">thrust faults</a> and bright <a href="Ray_system" title="Ray system">ray systems</a> formed by <a href="Ejecta" title="Ejecta">impact event remnants</a>.<sup id="cite_ref-111" class="reference"><a href="#cite_note-111"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup> The surface has widely varying temperature, with the <a href="Equator" title="Equator">equatorial</a> regions ranging from −170 °C (−270 °F) at night to 420 °C (790 °F) during sunlight. In the past, Mercury was volcanically active, producing smooth <a href="Basalt" title="Basalt">basaltic</a> plains similar to the Moon.<sup id="cite_ref-Head_et_al_1981_112-0" class="reference"><a href="#cite_note-Head_et_al_1981-112"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> It is likely that Mercury has a silicate crust and a large iron core.<sup id="cite_ref-113" class="reference"><a href="#cite_note-113"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Margot2012_114-0" class="reference"><a href="#cite_note-Margot2012-114"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup> Mercury has a very tenuous atmosphere, consisting of <a href="Solar_wind" title="Solar wind">solar-wind</a> particles and ejected atoms.<sup id="cite_ref-115" class="reference"><a href="#cite_note-115"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup> Mercury has no natural satellites.<sup id="cite_ref-spaceplace.nasa.gov_116-0" class="reference"><a href="#cite_note-spaceplace.nasa.gov-116"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="Venus" title="Venus">Venus</a></span></span> (0.72–0.73 AU)<sup id="cite_ref-nasa-factsheet_110-1" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> has a reflective, whitish atmosphere that is mainly composed of <a href="Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a>. At the surface, the atmospheric pressure is ninety times as dense as on Earth's sea level.<sup id="cite_ref-u3r1a_117-0" class="reference"><a href="#cite_note-u3r1a-117"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup> Venus has a surface temperatures over 400 °C (752 °F), mainly due to the amount of <a href="Greenhouse_gas" title="Greenhouse gas">greenhouse gases</a> in the atmosphere.<sup id="cite_ref-118" class="reference"><a href="#cite_note-118"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup> The planet lacks a protective magnetic field to protect against <a href="Atmospheric_stripping" class="mw-redirect" title="Atmospheric stripping">stripping</a> by the solar wind, which suggests that its atmosphere is sustained by volcanic activity.<sup id="cite_ref-119" class="reference"><a href="#cite_note-119"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup> Its surface displays extensive evidence of volcanic activity with stagnant <a href="Lid_tectonics" title="Lid tectonics">lid tectonics</a>.<sup id="cite_ref-120" class="reference"><a href="#cite_note-120"><span class="cite-bracket">[</span>106<span class="cite-bracket">]</span></a></sup> Venus has no natural satellites.<sup id="cite_ref-spaceplace.nasa.gov_116-1" class="reference"><a href="#cite_note-spaceplace.nasa.gov-116"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="Earth" title="Earth">Earth</a></span></span> (0.98–1.02 AU)<sup id="cite_ref-nasa-factsheet_110-2" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> is the only place in the universe where <a href="Life" title="Life">life</a> and <a href="Water_distribution_on_Earth" title="Water distribution on Earth">surface liquid water</a> are known to exist.<sup id="cite_ref-life_121-0" class="reference"><a href="#cite_note-life-121"><span class="cite-bracket">[</span>107<span class="cite-bracket">]</span></a></sup> Earth's atmosphere contains 78% <a href="Nitrogen" title="Nitrogen">nitrogen</a> and 21% <a href="Oxygen" title="Oxygen">oxygen</a>, which is the result of the presence of life.<sup id="cite_ref-handbook_122-0" class="reference"><a href="#cite_note-handbook-122"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NYT-20131003_123-0" class="reference"><a href="#cite_note-NYT-20131003-123"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup> The planet has a complex <a href="Climate" title="Climate">climate</a> and <a href="Weather" title="Weather">weather</a> system, with conditions differing drastically between <a href="Climate_region" class="mw-redirect" title="Climate region">climate regions</a>.<sup id="cite_ref-climate_zones_124-0" class="reference"><a href="#cite_note-climate_zones-124"><span class="cite-bracket">[</span>110<span class="cite-bracket">]</span></a></sup> The solid surface of Earth is dominated by green <a href="Vegetation" title="Vegetation">vegetation</a>, <a href="Hot_deserts" class="mw-redirect" title="Hot deserts">deserts</a> and white <a href="Ice_sheet" title="Ice sheet">ice sheets</a>.<sup id="cite_ref-Carlowicz_Simmon_2019_125-0" class="reference"><a href="#cite_note-Carlowicz_Simmon_2019-125"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Cain_2010_126-0" class="reference"><a href="#cite_note-Cain_2010-126"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-National_Geographic_Society_2006_127-0" class="reference"><a href="#cite_note-National_Geographic_Society_2006-127"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup> Earth's surface is shaped by <a href="Plate_tectonics" title="Plate tectonics">plate tectonics</a> that formed the continental masses.<sup id="cite_ref-Head_et_al_1981_112-1" class="reference"><a href="#cite_note-Head_et_al_1981-112"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> Earth's planetary <a href="Magnetosphere" title="Magnetosphere">magnetosphere</a> shields the surface from radiation, limiting <a href="Atmospheric_stripping" class="mw-redirect" title="Atmospheric stripping">atmospheric stripping</a> and maintaining life habitability.<sup id="cite_ref-128" class="reference"><a href="#cite_note-128"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup>
<ul><li>The <a href="Moon" title="Moon">Moon</a> is Earth's only natural satellite.<sup id="cite_ref-129" class="reference"><a href="#cite_note-129"><span class="cite-bracket">[</span>115<span class="cite-bracket">]</span></a></sup> Its diameter is one-quarter the size of Earth's.<sup id="cite_ref-Metzger2021_130-0" class="reference"><a href="#cite_note-Metzger2021-130"><span class="cite-bracket">[</span>116<span class="cite-bracket">]</span></a></sup> Its surface is covered in <a href="Lunar_soil" class="mw-redirect" title="Lunar soil">very fine regolith</a> and dominated by <a href="Impact_crater" title="Impact crater">impact craters</a>.<sup id="cite_ref-131" class="reference"><a href="#cite_note-131"><span class="cite-bracket">[</span>117<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-132" class="reference"><a href="#cite_note-132"><span class="cite-bracket">[</span>118<span class="cite-bracket">]</span></a></sup> Large dark patches on the Moon, <a href="Lunar_mare" title="Lunar mare">maria</a>, are formed from past volcanic activity.<sup id="cite_ref-133" class="reference"><a href="#cite_note-133"><span class="cite-bracket">[</span>119<span class="cite-bracket">]</span></a></sup> The Moon's atmosphere is extremely thin, consisting of a <a href="Partial_vacuum" class="mw-redirect" title="Partial vacuum">partial vacuum</a> with particle densities of under 10<sup>7</sup> per cm<sup>−3</sup>.<sup id="cite_ref-134" class="reference"><a href="#cite_note-134"><span class="cite-bracket">[</span>120<span class="cite-bracket">]</span></a></sup></li></ul></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="Mars" title="Mars">Mars</a></span></span> (1.38–1.67 AU)<sup id="cite_ref-nasa-factsheet_110-3" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> has a radius about half of that of Earth.<sup id="cite_ref-Seidelmann2007_135-0" class="reference"><a href="#cite_note-Seidelmann2007-135"><span class="cite-bracket">[</span>121<span class="cite-bracket">]</span></a></sup> Most of the planet is red due to <a href="Iron(III)_oxide" title="Iron(III) oxide">iron oxide</a> in Martian soil,<sup id="cite_ref-136" class="reference"><a href="#cite_note-136"><span class="cite-bracket">[</span>122<span class="cite-bracket">]</span></a></sup> and the polar regions are covered in <a href="Martian_polar_ice_caps" title="Martian polar ice caps">white ice caps</a> made of water and <a href="Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a>.<sup id="cite_ref-137" class="reference"><a href="#cite_note-137"><span class="cite-bracket">[</span>123<span class="cite-bracket">]</span></a></sup> Mars has an atmosphere composed mostly of carbon dioxide, with surface pressure 0.6% of that of Earth, which is sufficient to support some weather phenomena.<sup id="cite_ref-138" class="reference"><a href="#cite_note-138"><span class="cite-bracket">[</span>124<span class="cite-bracket">]</span></a></sup> During the Mars year (687 Earth days), there are large surface temperature swings on the surface between −78.5 °C (−109.3 °F) to 5.7 °C (42.3 °F). The surface is peppered with volcanoes and <a href="Rift_valley" title="Rift valley">rift valleys</a>, and has a rich collection of <a href="Mineral" title="Mineral">minerals</a>.<sup id="cite_ref-139" class="reference"><a href="#cite_note-139"><span class="cite-bracket">[</span>125<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ismars_140-0" class="reference"><a href="#cite_note-ismars-140"><span class="cite-bracket">[</span>126<span class="cite-bracket">]</span></a></sup> Mars has a highly <a href="Planetary_differentiation" title="Planetary differentiation">differentiated</a> internal structure, and lost its magnetosphere 4 billion years ago.<sup id="cite_ref-Nimmo_2005_141-0" class="reference"><a href="#cite_note-Nimmo_2005-141"><span class="cite-bracket">[</span>127<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-swind_142-0" class="reference"><a href="#cite_note-swind-142"><span class="cite-bracket">[</span>128<span class="cite-bracket">]</span></a></sup> <a href="Moons_of_Mars" title="Moons of Mars">Mars has two tiny moons</a>:<sup id="cite_ref-NYT-20200725_143-0" class="reference"><a href="#cite_note-NYT-20200725-143"><span class="cite-bracket">[</span>129<span class="cite-bracket">]</span></a></sup>
<ul><li><a href="Phobos_(moon)" title="Phobos (moon)">Phobos</a> is Mars's inner moon. It is a small, irregularly shaped object with a mean radius of 11 km (7 mi). Its surface is very unreflective and dominated by impact craters.<sup id="cite_ref-jplssd_144-0" class="reference"><a href="#cite_note-jplssd-144"><span class="cite-bracket">[</span>D 7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-145" class="reference"><a href="#cite_note-145"><span class="cite-bracket">[</span>130<span class="cite-bracket">]</span></a></sup> In particular, Phobos's surface has a very large <a href="Stickney_(crater)" title="Stickney (crater)">Stickney impact crater</a> that is roughly 4.5 km (2.8 mi) in radius.<sup id="cite_ref-146" class="reference"><a href="#cite_note-146"><span class="cite-bracket">[</span>131<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Deimos_(moon)" title="Deimos (moon)">Deimos</a> is Mars's outer moon. Like Phobos, it is irregularly shaped, with a mean radius of 6 km (4 mi) and its surface reflects little light.<sup id="cite_ref-Horizons-Deimos_147-0" class="reference"><a href="#cite_note-Horizons-Deimos-147"><span class="cite-bracket">[</span>D 8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-JPLSSD_148-0" class="reference"><a href="#cite_note-JPLSSD-148"><span class="cite-bracket">[</span>D 9<span class="cite-bracket">]</span></a></sup> However, the surface of Deimos is noticeably smoother than Phobos because the regolith partially covers the impact craters.<sup id="cite_ref-149" class="reference"><a href="#cite_note-149"><span class="cite-bracket">[</span>132<span class="cite-bracket">]</span></a></sup></li></ul></li></ul>
<div class="mw-heading mw-heading3"><h3 id="Asteroids">Asteroids</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Asteroid" title="Asteroid">Asteroid</a></div>
<p>Asteroids, except for the largest, Ceres, are classified as <a href="Small_Solar_System_bodies" class="mw-redirect" title="Small Solar System bodies">small Solar System bodies</a> and are composed mainly of <a href="Carbon" title="Carbon">carbonaceous</a>, refractory rocky and metallic minerals, with some ice.<sup id="cite_ref-150" class="reference"><a href="#cite_note-150"><span class="cite-bracket">[</span>133<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-151" class="reference"><a href="#cite_note-151"><span class="cite-bracket">[</span>134<span class="cite-bracket">]</span></a></sup> They range from a few meters to hundreds of kilometers in size. <span class="vanchor"><span class="vanchor-text">Many asteroids are divided into <a href="Asteroid_group" class="mw-redirect" title="Asteroid group">asteroid groups</a> and <a href="Asteroid_family" title="Asteroid family">families</a></span></span> based on their orbital characteristics. Some <a href="Minor-planet_moon" title="Minor-planet moon">asteroids have natural satellites that orbit them</a>, that is, asteroids that orbit larger asteroids.<sup id="cite_ref-152" class="reference"><a href="#cite_note-152"><span class="cite-bracket">[</span>135<span class="cite-bracket">]</span></a></sup>
</p><ul><li><a href="List_of_Mercury-crossing_minor_planets" title="List of Mercury-crossing minor planets">Mercury-crossing asteroids</a> are those with <a href="Perihelia" class="mw-redirect" title="Perihelia">perihelia</a> within the orbit of Mercury. At least 362 are known to date, and include the closest objects to the Sun known in the Solar System.<sup id="cite_ref-JPLcrosserlist_153-0" class="reference"><a href="#cite_note-JPLcrosserlist-153"><span class="cite-bracket">[</span>136<span class="cite-bracket">]</span></a></sup> No <a href="Vulcanoid" title="Vulcanoid">vulcanoids</a>, asteroids between the orbit of Mercury and the Sun, have been discovered.<sup id="cite_ref-154" class="reference"><a href="#cite_note-154"><span class="cite-bracket">[</span>137<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Steffl2013_155-0" class="reference"><a href="#cite_note-Steffl2013-155"><span class="cite-bracket">[</span>138<span class="cite-bracket">]</span></a></sup> As of 2024, one asteroid has been discovered to orbit completely within Venus's orbit, <a href="594913_%EA%9E%8CAyl%C3%B3%EA%9E%8Cchaxnim" title="594913 ꞌAylóꞌchaxnim">594913 ꞌAylóꞌchaxnim</a>.<sup id="cite_ref-156" class="reference"><a href="#cite_note-156"><span class="cite-bracket">[</span>139<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Venus-crossing_asteroid" class="mw-redirect" title="Venus-crossing asteroid">Venus-crossing asteroids</a> are those that cross the orbit of Venus. There are 2,809 as of 2015.<sup id="cite_ref-jpello_157-0" class="reference"><a href="#cite_note-jpello-157"><span class="cite-bracket">[</span>140<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Near-Earth_object" title="Near-Earth object">Near-Earth asteroids</a> have orbits that approach relatively close to Earth's orbit,<sup id="cite_ref-MorbidelliAstIII_158-0" class="reference"><a href="#cite_note-MorbidelliAstIII-158"><span class="cite-bracket">[</span>141<span class="cite-bracket">]</span></a></sup> and some of them are <a href="Potentially_hazardous_object" title="Potentially hazardous object">potentially hazardous objects</a> because they might collide with Earth in the future.<sup id="cite_ref-CNEOS-Basics_159-0" class="reference"><a href="#cite_note-CNEOS-Basics-159"><span class="cite-bracket">[</span>142<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NEO-groups_160-0" class="reference"><a href="#cite_note-NEO-groups-160"><span class="cite-bracket">[</span>143<span class="cite-bracket">]</span></a></sup> There are over 37,000 known as of 2024.<sup id="cite_ref-neo-jpl-stats_161-0" class="reference"><a href="#cite_note-neo-jpl-stats-161"><span class="cite-bracket">[</span>144<span class="cite-bracket">]</span></a></sup> A number of solar-orbiting <a href="Meteoroid" title="Meteoroid">meteoroids</a> were large enough to be tracked in space before striking Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of Earth.<sup id="cite_ref-BROWN02_162-0" class="reference"><a href="#cite_note-BROWN02-162"><span class="cite-bracket">[</span>145<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Mars-crossing_asteroids" class="mw-redirect" title="Mars-crossing asteroids">Mars-crossing asteroids</a> are those with perhihelia above 1.3 AU which cross the orbit of Mars.<sup id="cite_ref-163" class="reference"><a href="#cite_note-163"><span class="cite-bracket">[</span>146<span class="cite-bracket">]</span></a></sup> As of 2024, NASA lists 26,182 confirmed Mars-crossing asteroids.<sup id="cite_ref-jpello_157-1" class="reference"><a href="#cite_note-jpello-157"><span class="cite-bracket">[</span>140<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading4"><h4 id="Asteroid_belt">Asteroid belt</h4></div>
<p>The <a href="Asteroid_belt" title="Asteroid belt">asteroid belt</a> occupies a torus-shaped region between 2.3 and <span class="nowrap">3.3 AU</span> from the Sun, which lies between the orbits of Mars and Jupiter. It is thought to be remnants from the Solar System's formation that failed to coalesce because of the gravitational interference of Jupiter.<sup id="cite_ref-164" class="reference"><a href="#cite_note-164"><span class="cite-bracket">[</span>147<span class="cite-bracket">]</span></a></sup> The asteroid belt contains tens of thousands, possibly millions, of objects over one kilometer in diameter.<sup id="cite_ref-165" class="reference"><a href="#cite_note-165"><span class="cite-bracket">[</span>148<span class="cite-bracket">]</span></a></sup> Despite this, the total mass of the asteroid belt is unlikely to be more than a thousandth of that of Earth.<sup id="cite_ref-Krasinsky2002_56-1" class="reference"><a href="#cite_note-Krasinsky2002-56"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> The asteroid belt is very sparsely populated; spacecraft routinely pass through without incident.<sup id="cite_ref-166" class="reference"><a href="#cite_note-166"><span class="cite-bracket">[</span>149<span class="cite-bracket">]</span></a></sup>
</p>
<p>Below are the descriptions of the three largest bodies in the asteroid belt. They are all considered to be relatively intact <a href="Protoplanet" title="Protoplanet">protoplanets</a>, a precursor stage before becoming a fully-formed planet (see <a href="List_of_exceptional_asteroids" title="List of exceptional asteroids">List of exceptional asteroids</a>):<sup id="cite_ref-167" class="reference"><a href="#cite_note-167"><span class="cite-bracket">[</span>150<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-nasa-dawn20110329_168-0" class="reference"><a href="#cite_note-nasa-dawn20110329-168"><span class="cite-bracket">[</span>151<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Marsset2020_169-0" class="reference"><a href="#cite_note-Marsset2020-169"><span class="cite-bracket">[</span>152<span class="cite-bracket">]</span></a></sup>
</p>
<ul><li><span class="vanchor"><span class="vanchor-text"><a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></span></span> (2.55–2.98 AU) is the only dwarf planet in the asteroid belt.<sup id="cite_ref-IAU-QA_170-0" class="reference"><a href="#cite_note-IAU-QA-170"><span class="cite-bracket">[</span>153<span class="cite-bracket">]</span></a></sup> It is the largest object in the belt, with a diameter of 940 km (580 mi).<sup id="cite_ref-Ermakov2017_171-0" class="reference"><a href="#cite_note-Ermakov2017-171"><span class="cite-bracket">[</span>154<span class="cite-bracket">]</span></a></sup> Its surface contains a mixture of <a href="Carbon" title="Carbon">carbon</a>,<sup id="cite_ref-Nature_12_2018_172-0" class="reference"><a href="#cite_note-Nature_12_2018-172"><span class="cite-bracket">[</span>155<span class="cite-bracket">]</span></a></sup> frozen water and <a href="Hydrate" title="Hydrate">hydrated</a> minerals.<sup id="cite_ref-EPSC2_173-0" class="reference"><a href="#cite_note-EPSC2-173"><span class="cite-bracket">[</span>156<span class="cite-bracket">]</span></a></sup> There are signs of past <a href="Cryovolcano" title="Cryovolcano">cryovolcanic</a> activity, where <a href="Volatile_(astrogeology)" title="Volatile (astrogeology)">volatile</a> material such as water are erupted onto the surface, as seen in <a href="Bright_spots_on_Ceres" title="Bright spots on Ceres">surface bright spots</a>.<sup id="cite_ref-174" class="reference"><a href="#cite_note-174"><span class="cite-bracket">[</span>157<span class="cite-bracket">]</span></a></sup> Ceres has a very thin water vapor atmosphere, but practically speaking it is indistinguishable from a vacuum.<sup id="cite_ref-175" class="reference"><a href="#cite_note-175"><span class="cite-bracket">[</span>158<span class="cite-bracket">]</span></a></sup></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="4_Vesta" title="4 Vesta">Vesta</a></span></span> (2.13–3.41 AU) is the second-largest object in the asteroid belt.<sup id="cite_ref-Astronomy_&_Astrophysics_176-0" class="reference"><a href="#cite_note-Astronomy_&_Astrophysics-176"><span class="cite-bracket">[</span>159<span class="cite-bracket">]</span></a></sup> Its fragments survive as the <a href="Vesta_family" title="Vesta family">Vesta asteroid family</a><sup id="cite_ref-planetarysociety_177-0" class="reference"><a href="#cite_note-planetarysociety-177"><span class="cite-bracket">[</span>160<span class="cite-bracket">]</span></a></sup> and numerous <a href="HED_meteorite" title="HED meteorite">HED meteorites</a> found on Earth.<sup id="cite_ref-Vestainterior_178-0" class="reference"><a href="#cite_note-Vestainterior-178"><span class="cite-bracket">[</span>161<span class="cite-bracket">]</span></a></sup> Vesta's surface, dominated by <a href="Basalt" title="Basalt">basaltic</a> and <a href="Metamorphic_rock" title="Metamorphic rock">metamorphic</a> material, has a denser composition than Ceres's.<sup id="cite_ref-Takeda1997_179-0" class="reference"><a href="#cite_note-Takeda1997-179"><span class="cite-bracket">[</span>162<span class="cite-bracket">]</span></a></sup> Its surface is marked by two giant craters: <a href="Rheasilvia" title="Rheasilvia">Rheasilvia</a> and <a href="Veneneia_(crater)" title="Veneneia (crater)">Veneneia</a>.<sup id="cite_ref-Schenk2012_180-0" class="reference"><a href="#cite_note-Schenk2012-180"><span class="cite-bracket">[</span>163<span class="cite-bracket">]</span></a></sup></li>
<li><a href="2_Pallas" title="2 Pallas">Pallas</a> (2.15–2.57 AU) is the third-largest object in the asteroid belt.<sup id="cite_ref-Astronomy_&_Astrophysics_176-1" class="reference"><a href="#cite_note-Astronomy_&_Astrophysics-176"><span class="cite-bracket">[</span>159<span class="cite-bracket">]</span></a></sup> It has its own <a href="Pallas_family" title="Pallas family">Pallas</a> <a href="Vesta_family" title="Vesta family">asteroid family</a>.<sup id="cite_ref-planetarysociety_177-1" class="reference"><a href="#cite_note-planetarysociety-177"><span class="cite-bracket">[</span>160<span class="cite-bracket">]</span></a></sup> Not much is known about Pallas because it has never been visited by a spacecraft,<sup id="cite_ref-181" class="reference"><a href="#cite_note-181"><span class="cite-bracket">[</span>164<span class="cite-bracket">]</span></a></sup> though its surface is predicted to be composed of silicates.<sup id="cite_ref-AutoCB-19_182-0" class="reference"><a href="#cite_note-AutoCB-19-182"><span class="cite-bracket">[</span>165<span class="cite-bracket">]</span></a></sup></li></ul>
<p><a href="Hilda_asteroid" title="Hilda asteroid">Hilda asteroids</a> are in a 3:2 resonance with Jupiter; that is, they go around the Sun three times for every two Jovian orbits.<sup id="cite_ref-Barucci_183-0" class="reference"><a href="#cite_note-Barucci-183"><span class="cite-bracket">[</span>166<span class="cite-bracket">]</span></a></sup> They lie in three linked clusters between Jupiter and the main asteroid belt.
</p><p><a href="Trojan_(celestial_body)" title="Trojan (celestial body)">Trojans</a> are bodies located within another body's gravitationally stable <a href="Lagrangian_point" class="mw-redirect" title="Lagrangian point">Lagrange points</a>: <a href="Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>4</sub></a>, 60° ahead in its orbit, or <a href="Lagrange_point#L4_and_L5" title="Lagrange point">L<sub>5</sub></a>, 60° behind in its orbit.<sup id="cite_ref-spies_184-0" class="reference"><a href="#cite_note-spies-184"><span class="cite-bracket">[</span>167<span class="cite-bracket">]</span></a></sup> Every planet except Mercury is known to possess at least one trojan.<sup id="cite_ref-Connors_185-0" class="reference"><a href="#cite_note-Connors-185"><span class="cite-bracket">[</span>168<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-secondUranus_186-0" class="reference"><a href="#cite_note-secondUranus-186"><span class="cite-bracket">[</span>169<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-CeresVestatrojans_187-0" class="reference"><a href="#cite_note-CeresVestatrojans-187"><span class="cite-bracket">[</span>170<span class="cite-bracket">]</span></a></sup> The <a href="Jupiter_trojan" title="Jupiter trojan">Jupiter trojan</a> population is roughly equal to that of the asteroid belt.<sup id="cite_ref-Yoshida2005_188-0" class="reference"><a href="#cite_note-Yoshida2005-188"><span class="cite-bracket">[</span>171<span class="cite-bracket">]</span></a></sup> After Jupiter, Neptune possesses the most confirmed trojans, at 28.<sup id="cite_ref-189" class="reference"><a href="#cite_note-189"><span class="cite-bracket">[</span>172<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Outer_Solar_System">Outer Solar System</h2></div>
<p>The outer region of the Solar System is home to the <a href="Giant_planet" title="Giant planet">giant planets</a> and their large moons. The <a href="Centaur_(minor_planet)" class="mw-redirect" title="Centaur (minor planet)">centaurs</a> and many <a href="Short-period_comet" class="mw-redirect" title="Short-period comet">short-period comets</a> orbit in this region. Due to their greater distance from the Sun, the solid objects in the outer Solar System contain a higher proportion of volatiles such as water, ammonia, and methane, than planets of the inner Solar System because their lower temperatures allow these compounds to remain solid, without significant <a href="Sublimation_(phase_transition)" title="Sublimation (phase transition)">sublimation</a>.<sup id="cite_ref-bennett_8.2_36-4" class="reference"><a href="#cite_note-bennett_8.2-36"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Outer_planets">Outer planets</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Giant_planet" title="Giant planet">Giant planet</a></div>
<p>The four outer planets, called giant planets or Jovian planets, collectively make up 99% of the mass orbiting the Sun.<sup id="cite_ref-footnoteD_57-1" class="reference"><a href="#cite_note-footnoteD-57"><span class="cite-bracket">[</span>h<span class="cite-bracket">]</span></a></sup> All four giant planets have multiple moons and a ring system, although only Saturn's rings are easily observed from Earth.<sup id="cite_ref-Ryden_109-1" class="reference"><a href="#cite_note-Ryden-109"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup> Jupiter and Saturn are composed mainly of gases with extremely low melting points, such as hydrogen, helium, and <a href="Neon" title="Neon">neon</a>,<sup id="cite_ref-Podolak_Podolak_et_al._2000_190-0" class="reference"><a href="#cite_note-Podolak_Podolak_et_al._2000-190"><span class="cite-bracket">[</span>173<span class="cite-bracket">]</span></a></sup> hence their designation as <a href="Gas_giant" title="Gas giant">gas giants</a>.<sup id="cite_ref-191" class="reference"><a href="#cite_note-191"><span class="cite-bracket">[</span>174<span class="cite-bracket">]</span></a></sup> Uranus and Neptune are <a href="Ice_giants" class="mw-redirect" title="Ice giants">ice giants</a>,<sup id="cite_ref-192" class="reference"><a href="#cite_note-192"><span class="cite-bracket">[</span>175<span class="cite-bracket">]</span></a></sup> meaning they are largely composed of <a href="Volatile_(astrogeology)" title="Volatile (astrogeology)">'ice' in the astronomical sense</a> (chemical compounds with melting points of up to a few hundred <a href="Kelvin" title="Kelvin">kelvins</a><sup id="cite_ref-Podolak_Podolak_et_al._2000_190-1" class="reference"><a href="#cite_note-Podolak_Podolak_et_al._2000-190"><span class="cite-bracket">[</span>173<span class="cite-bracket">]</span></a></sup> such as water, methane, ammonia, <a href="Hydrogen_sulfide" title="Hydrogen sulfide">hydrogen sulfide</a>, and <a href="Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a>.<sup id="cite_ref-Podolak_Weizman_et_al._1995_193-0" class="reference"><a href="#cite_note-Podolak_Weizman_et_al._1995-193"><span class="cite-bracket">[</span>176<span class="cite-bracket">]</span></a></sup>) Icy substances comprise the majority of the satellites of the giant planets and small objects that lie beyond Neptune's orbit.<sup id="cite_ref-Podolak_Weizman_et_al._1995_193-1" class="reference"><a href="#cite_note-Podolak_Weizman_et_al._1995-193"><span class="cite-bracket">[</span>176<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-zeilik_194-0" class="reference"><a href="#cite_note-zeilik-194"><span class="cite-bracket">[</span>177<span class="cite-bracket">]</span></a></sup>
</p>
<ul><li><span class="vanchor"><span class="vanchor-text"><a href="Jupiter" title="Jupiter">Jupiter</a></span></span> (4.95–5.46 AU)<sup id="cite_ref-nasa-factsheet_110-4" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> is the biggest and most massive planet in the Solar System. On its surface, there are orange-brown and white cloud bands moving via the principles of <a href="Atmospheric_circulation" title="Atmospheric circulation">atmospheric circulation</a>, with giant storms swirling on the surface such as the <a href="Great_Red_Spot" title="Great Red Spot">Great Red Spot</a> and <a href="Oval_BA" class="mw-redirect" title="Oval BA">white 'ovals'</a>. <a href="Magnetosphere_of_Jupiter" title="Magnetosphere of Jupiter">Jupiter possesses a strong enough magnetosphere</a> to redirect <a href="Ionizing_radiation" title="Ionizing radiation">ionizing radiation</a> and cause <a href="Aurora" title="Aurora">auroras</a> on its poles.<sup id="cite_ref-195" class="reference"><a href="#cite_note-195"><span class="cite-bracket">[</span>178<span class="cite-bracket">]</span></a></sup> As of 2025, Jupiter has <a href="Moons_of_Jupiter" title="Moons of Jupiter">97 confirmed satellites</a>, which can roughly be sorted into three groups:
<ul><li>The Amalthea group, consisting of <a href="Metis_(moon)" title="Metis (moon)">Metis</a>, <a href="Adrastea_(moon)" title="Adrastea (moon)">Adrastea</a>, <a href="Amalthea_(moon)" title="Amalthea (moon)">Amalthea</a>, and <a href="Thebe_(moon)" title="Thebe (moon)">Thebe</a>. They orbit substantially closer to Jupiter than other satellites.<sup id="cite_ref-196" class="reference"><a href="#cite_note-196"><span class="cite-bracket">[</span>179<span class="cite-bracket">]</span></a></sup> Materials from these natural satellites are the source of Jupiter's faint ring.<sup id="cite_ref-197" class="reference"><a href="#cite_note-197"><span class="cite-bracket">[</span>180<span class="cite-bracket">]</span></a></sup></li>
<li>The <a href="Galilean_moons" title="Galilean moons">Galilean moons</a>, consisting of <a href="Ganymede_(moon)" title="Ganymede (moon)">Ganymede</a>, <a href="Callisto_(moon)" title="Callisto (moon)">Callisto</a>, <a href="Io_(moon)" title="Io (moon)">Io</a>, and <a href="Europa_(moon)" title="Europa (moon)">Europa</a>. They are the largest moons of Jupiter and exhibit planetary properties.<sup id="cite_ref-198" class="reference"><a href="#cite_note-198"><span class="cite-bracket">[</span>181<span class="cite-bracket">]</span></a></sup></li>
<li>Irregular satellites, consisting of substantially smaller natural satellites. They have more distant orbits than the other objects.<sup id="cite_ref-list_199-0" class="reference"><a href="#cite_note-list-199"><span class="cite-bracket">[</span>182<span class="cite-bracket">]</span></a></sup></li></ul></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="Saturn" title="Saturn">Saturn</a></span></span> (9.08–10.12 AU)<sup id="cite_ref-nasa-factsheet_110-5" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> has a distinctive visible <a href="Rings_of_Saturn" title="Rings of Saturn">ring system</a> orbiting around its equator composed of small ice and rock particles. Like Jupiter, it is mostly made of hydrogen and helium.<sup id="cite_ref-200" class="reference"><a href="#cite_note-200"><span class="cite-bracket">[</span>183<span class="cite-bracket">]</span></a></sup> At its north and south poles, Saturn has peculiar <a href="Saturn's_hexagon" title="Saturn's hexagon">hexagon-shaped storms</a> larger than the diameter of Earth. <a href="Magnetosphere_of_Saturn" title="Magnetosphere of Saturn">Saturn has a magnetosphere</a> capable of producing weak auroras. As of 2025, Saturn has <a href="Moons_of_Saturn" title="Moons of Saturn">274 confirmed satellites</a>, grouped into:
<ul><li>Ring <a href="Moonlet" title="Moonlet">moonlets</a> and <a href="Shepherd_moon" title="Shepherd moon">shepherds</a>, which orbit inside or close to Saturn's rings. A moonlet can only partially clear out dust in its orbit,<sup id="cite_ref-Sremcevic2007_201-0" class="reference"><a href="#cite_note-Sremcevic2007-201"><span class="cite-bracket">[</span>184<span class="cite-bracket">]</span></a></sup> while the ring shepherds are able to completely clear out dust, forming visible gaps in the rings.<sup id="cite_ref-Porco2005_202-0" class="reference"><a href="#cite_note-Porco2005-202"><span class="cite-bracket">[</span>185<span class="cite-bracket">]</span></a></sup></li>
<li>Inner large satellites <a href="Mimas" title="Mimas">Mimas</a>, <a href="Enceladus" title="Enceladus">Enceladus</a>, <a href="Tethys_(moon)" title="Tethys (moon)">Tethys</a>, and <a href="Dione_(moon)" title="Dione (moon)">Dione</a>. These satellites orbit within <a href="Rings_of_Saturn#E_Ring" title="Rings of Saturn">Saturn's E ring</a>. They are composed mostly of water ice and are believed to have differentiated internal structures.<sup id="cite_ref-:2_203-0" class="reference"><a href="#cite_note-:2-203"><span class="cite-bracket">[</span>186<span class="cite-bracket">]</span></a></sup></li>
<li>Trojan moons <a href="Calypso_(moon)" title="Calypso (moon)">Calypso</a> and <a href="Telesto_(moon)" title="Telesto (moon)">Telesto</a> (trojans of Tethys), and <a href="Helene_(moon)" title="Helene (moon)">Helene</a> and <a href="Polydeuces_(moon)" title="Polydeuces (moon)">Polydeuces</a> (trojans of Dione). These small moons share their orbits with Tethys and Dione, leading or trailing either.<sup id="cite_ref-Calypso_204-0" class="reference"><a href="#cite_note-Calypso-204"><span class="cite-bracket">[</span>187<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Polydeuces_205-0" class="reference"><a href="#cite_note-Polydeuces-205"><span class="cite-bracket">[</span>188<span class="cite-bracket">]</span></a></sup></li>
<li>Outer large satellites <a href="Rhea_(moon)" title="Rhea (moon)">Rhea</a>, <a href="Titan_(moon)" title="Titan (moon)">Titan</a>, <a href="Hyperion_(moon)" title="Hyperion (moon)">Hyperion</a>, and <a href="Iapetus_(moon)" title="Iapetus (moon)">Iapetus</a>.<sup id="cite_ref-:2_203-1" class="reference"><a href="#cite_note-:2-203"><span class="cite-bracket">[</span>186<span class="cite-bracket">]</span></a></sup> Titan is the only satellite in the Solar System to have a substantial atmosphere.<sup id="cite_ref-Forget2017_206-0" class="reference"><a href="#cite_note-Forget2017-206"><span class="cite-bracket">[</span>189<span class="cite-bracket">]</span></a></sup></li>
<li>Irregular satellites, consisting of substantially smaller natural satellites. They have more distant orbits than the other objects. <a href="Phoebe_(moon)" title="Phoebe (moon)">Phoebe</a> is the largest irregular satellite of Saturn.<sup id="cite_ref-Jewitt2007_207-0" class="reference"><a href="#cite_note-Jewitt2007-207"><span class="cite-bracket">[</span>190<span class="cite-bracket">]</span></a></sup></li></ul></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="Uranus" title="Uranus">Uranus</a></span></span> (18.3–20.1 AU),<sup id="cite_ref-nasa-factsheet_110-6" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> uniquely among the planets, orbits the Sun on its side with an <a href="Axial_tilt" title="Axial tilt">axial tilt</a> >90°. This gives the planet extreme seasonal variation as each pole points alternately toward and then away from the Sun.<sup id="cite_ref-208" class="reference"><a href="#cite_note-208"><span class="cite-bracket">[</span>191<span class="cite-bracket">]</span></a></sup> Uranus's outer layer has a muted <a href="Cyan" title="Cyan">cyan</a> color, but underneath these clouds are <a href="Climate_of_Uranus" title="Climate of Uranus">many mysteries about its climate</a>, such as unusually low <a href="Internal_heat" class="mw-redirect" title="Internal heat">internal heat</a> and erratic cloud formation. As of 2025, Uranus has <a href="Moons_of_Uranus" title="Moons of Uranus">28 confirmed satellites</a>, divided into three groups:
<ul><li>Inner satellites, which orbit inside Uranus's ring system.<sup id="cite_ref-Esposito2002_209-0" class="reference"><a href="#cite_note-Esposito2002-209"><span class="cite-bracket">[</span>192<span class="cite-bracket">]</span></a></sup> They are very close to each other, which suggests that their orbits are <a href="Chaotic_system" class="mw-redirect" title="Chaotic system">chaotic</a>.<sup id="cite_ref-Duncan_Lissauer_1997_210-0" class="reference"><a href="#cite_note-Duncan_Lissauer_1997-210"><span class="cite-bracket">[</span>193<span class="cite-bracket">]</span></a></sup></li>
<li>Large satellites, consisting of <a href="Titania_(moon)" title="Titania (moon)">Titania</a>, <a href="Oberon_(moon)" title="Oberon (moon)">Oberon</a>, <a href="Umbriel" title="Umbriel">Umbriel</a>, <a href="Ariel_(moon)" title="Ariel (moon)">Ariel</a>, and <a href="Miranda_(moon)" title="Miranda (moon)">Miranda</a>.<sup id="cite_ref-211" class="reference"><a href="#cite_note-211"><span class="cite-bracket">[</span>194<span class="cite-bracket">]</span></a></sup> Most of them have roughly equal amounts of rock and ice, except Miranda, which is made primarily of ice.<sup id="cite_ref-Hussmann_Sohl_et_al._2006_212-0" class="reference"><a href="#cite_note-Hussmann_Sohl_et_al._2006-212"><span class="cite-bracket">[</span>195<span class="cite-bracket">]</span></a></sup></li>
<li>Irregular satellites, having more distant and eccentric orbits than the other objects.<sup id="cite_ref-Sheppardmoons2024_213-0" class="reference"><a href="#cite_note-Sheppardmoons2024-213"><span class="cite-bracket">[</span>196<span class="cite-bracket">]</span></a></sup></li></ul></li>
<li><span class="vanchor"><span class="vanchor-text"><a href="Neptune" title="Neptune">Neptune</a></span></span> (29.9–30.5 AU)<sup id="cite_ref-nasa-factsheet_110-7" class="reference"><a href="#cite_note-nasa-factsheet-110"><span class="cite-bracket">[</span>D 6<span class="cite-bracket">]</span></a></sup> is the furthest planet known in the Solar System. Its outer atmosphere has a slightly muted cyan color, with occasional storms on the surface that look like dark spots. Like Uranus, many atmospheric phenomena of Neptune are unexplained, such as the <a href="Thermosphere" title="Thermosphere">thermosphere</a>'s abnormally high temperature or the strong tilt (47°) of its magnetosphere. As of 2025, Neptune has <a href="Moons_of_Neptune" title="Moons of Neptune">16 confirmed satellites</a>, divided into two groups:
<ul><li>Regular satellites, which have circular orbits that lie near Neptune's equator.<sup id="cite_ref-Jewitt2007_207-1" class="reference"><a href="#cite_note-Jewitt2007-207"><span class="cite-bracket">[</span>190<span class="cite-bracket">]</span></a></sup></li>
<li>Irregular satellites, which as the name implies, have less regular orbits. One of them, <a href="Triton_(moon)" title="Triton (moon)">Triton</a>, is Neptune's largest moon. It is geologically active, with erupting <a href="Geyser" title="Geyser">geysers</a> of nitrogen gas, and possesses a thin, cloudy nitrogen atmosphere.<sup id="cite_ref-Soderblom2_214-0" class="reference"><a href="#cite_note-Soderblom2-214"><span class="cite-bracket">[</span>197<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Forget2017_206-1" class="reference"><a href="#cite_note-Forget2017-206"><span class="cite-bracket">[</span>189<span class="cite-bracket">]</span></a></sup></li></ul></li></ul>
<div class="mw-heading mw-heading3"><h3 id="Centaurs">Centaurs</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Centaur_(small_Solar_System_body)" title="Centaur (small Solar System body)">Centaur</a></div>
<p>The centaurs are icy, comet-like bodies whose <a href="Semi-major_and_semi-minor_axes" title="Semi-major and semi-minor axes">semi-major axes</a> are longer than Jupiter's and shorter than Neptune's (between 5.5 and 30 AU). These are former Kuiper belt and <a href="Scattered_disc" title="Scattered disc">scattered disc objects</a> (SDOs) that were gravitationally <a href="Perturbation_(astronomy)" title="Perturbation (astronomy)">perturbed</a> closer to the Sun by the outer planets, and are expected to become comets or be ejected out of the Solar System.<sup id="cite_ref-Delsanti-Beyond_The_Planets_55-1" class="reference"><a href="#cite_note-Delsanti-Beyond_The_Planets-55"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> While most centaurs are inactive and asteroid-like, some exhibit cometary activity, such as the first centaur discovered, <a href="2060_Chiron" title="2060 Chiron">2060 Chiron</a>, which has been classified as a comet (95P) because it develops a coma just as comets do when they approach the Sun.<sup id="cite_ref-215" class="reference"><a href="#cite_note-215"><span class="cite-bracket">[</span>198<span class="cite-bracket">]</span></a></sup> The largest known centaur, <a href="10199_Chariklo" title="10199 Chariklo">10199 Chariklo</a>, has a diameter of about 250 km (160 mi) and is one of the few minor planets possessing a ring system.<sup id="cite_ref-spitzer_216-0" class="reference"><a href="#cite_note-spitzer-216"><span class="cite-bracket">[</span>199<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Braga-Ribas-2014_217-0" class="reference"><a href="#cite_note-Braga-Ribas-2014-217"><span class="cite-bracket">[</span>200<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Trans-Neptunian_region">Trans-Neptunian region</h2></div>
<p>Beyond the orbit of Neptune lies the area of the "<a href="Trans-Neptunian_object" title="Trans-Neptunian object">trans-Neptunian region</a>", with the doughnut-shaped Kuiper belt, home of Pluto and several other dwarf planets, and an overlapping disc of scattered objects, which is <a href="Orbital_inclination" title="Orbital inclination">tilted toward the plane</a> of the Solar System and reaches much further out than the Kuiper belt. The entire region is still <a href="Timeline_of_Solar_System_exploration" title="Timeline of Solar System exploration">largely unexplored</a>. It appears to consist overwhelmingly of many thousands of small worlds – the largest having a diameter only a fifth that of Earth and a mass far smaller than that of the Moon – composed mainly of rock and ice. This region is sometimes described as the "third zone of the Solar System", enclosing the inner and the outer Solar System.<sup id="cite_ref-218" class="reference"><a href="#cite_note-218"><span class="cite-bracket">[</span>201<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Kuiper_belt">Kuiper belt</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Kuiper_belt" title="Kuiper belt">Kuiper belt</a></div>
<p>The Kuiper belt is a great ring of debris similar to the asteroid belt, but consisting mainly of objects composed primarily of ice.<sup id="cite_ref-physical_219-0" class="reference"><a href="#cite_note-physical-219"><span class="cite-bracket">[</span>202<span class="cite-bracket">]</span></a></sup> It extends between 30 and 50 AU from the Sun. It is composed mainly of small Solar System bodies, although the largest few are probably large enough to be dwarf planets.<sup id="cite_ref-Grundy2019_220-0" class="reference"><a href="#cite_note-Grundy2019-220"><span class="cite-bracket">[</span>203<span class="cite-bracket">]</span></a></sup> There are estimated to be over 100,000 Kuiper belt objects with a diameter greater than 50 km (30 mi), but the total mass of the Kuiper belt is thought to be only a tenth or even a hundredth the mass of Earth.<sup id="cite_ref-Delsanti-Beyond_The_Planets_55-2" class="reference"><a href="#cite_note-Delsanti-Beyond_The_Planets-55"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> Many Kuiper belt objects have satellites,<sup id="cite_ref-221" class="reference"><a href="#cite_note-221"><span class="cite-bracket">[</span>204<span class="cite-bracket">]</span></a></sup> and most have orbits that are substantially inclined (~10°) to the plane of the ecliptic.<sup id="cite_ref-trojan_222-0" class="reference"><a href="#cite_note-trojan-222"><span class="cite-bracket">[</span>205<span class="cite-bracket">]</span></a></sup>
</p><p>The Kuiper belt can be roughly divided into the "<a href="Classical_Kuiper_belt_object" title="Classical Kuiper belt object">classical</a>" belt and the <a href="Resonant_trans-Neptunian_object" title="Resonant trans-Neptunian object">resonant trans-Neptunian objects</a>.<sup id="cite_ref-physical_219-1" class="reference"><a href="#cite_note-physical-219"><span class="cite-bracket">[</span>202<span class="cite-bracket">]</span></a></sup> The latter have orbits whose periods are in a simple ratio to that of Neptune: for example, going around the Sun twice for every three times that Neptune does, or once for every two. The classical belt consists of objects having no resonance with Neptune, and extends from roughly 39.4 to 47.7 AU.<sup id="cite_ref-223" class="reference"><a href="#cite_note-223"><span class="cite-bracket">[</span>206<span class="cite-bracket">]</span></a></sup> Members of the classical Kuiper belt are sometimes called "cubewanos", after the first of their kind to be discovered, originally designated <a href="15760_Albion" title="15760 Albion">1992 <i>QB<sub>1</sub></i></a>, (and has since been named Albion); they are still in near primordial, low-eccentricity orbits.<sup id="cite_ref-224" class="reference"><a href="#cite_note-224"><span class="cite-bracket">[</span>207<span class="cite-bracket">]</span></a></sup>
</p><p>There is strong consensus among astronomers that five members of the Kuiper belt are <span class="vanchor"><span class="vanchor-text">dwarf planets</span></span>.<sup id="cite_ref-Grundy2019_220-1" class="reference"><a href="#cite_note-Grundy2019-220"><span class="cite-bracket">[</span>203<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-JWST_225-0" class="reference"><a href="#cite_note-JWST-225"><span class="cite-bracket">[</span>208<span class="cite-bracket">]</span></a></sup> Many dwarf planet candidates are being considered, pending further data for verification.<sup id="cite_ref-Tancredi2008_226-0" class="reference"><a href="#cite_note-Tancredi2008-226"><span class="cite-bracket">[</span>209<span class="cite-bracket">]</span></a></sup>
</p>
<ul><li><span class="vanchor"><span class="vanchor-text"><a href="Pluto" title="Pluto">Pluto</a></span></span> (29.7–49.3 AU) is the largest known object in the Kuiper belt. Pluto has a relatively eccentric orbit, inclined 17 degrees to the <a href="Ecliptic_plane" class="mw-redirect" title="Ecliptic plane">ecliptic plane</a>. Pluto has a <a href="Orbital_resonance" title="Orbital resonance">2:3 resonance</a> with Neptune, meaning that Pluto orbits twice around the Sun for every three Neptunian orbits. Kuiper belt objects whose orbits share this resonance are called <a href="Plutino" title="Plutino">plutinos</a>.<sup id="cite_ref-Fajans_et_al_2001_227-0" class="reference"><a href="#cite_note-Fajans_et_al_2001-227"><span class="cite-bracket">[</span>210<span class="cite-bracket">]</span></a></sup> <a href="Moons_of_Pluto" title="Moons of Pluto">Pluto has five moons</a>: Charon, <a href="Styx_(moon)" title="Styx (moon)">Styx</a>, <a href="Nix_(moon)" title="Nix (moon)">Nix</a>, <a href="Kerberos_(moon)" title="Kerberos (moon)">Kerberos</a>, and <a href="Hydra_(moon)" title="Hydra (moon)">Hydra</a>.<sup id="cite_ref-228" class="reference"><a href="#cite_note-228"><span class="cite-bracket">[</span>211<span class="cite-bracket">]</span></a></sup>
<ul><li><a href="Charon_(moon)" title="Charon (moon)">Charon</a>, the largest of Pluto's moons, is sometimes described as part of a <a href="Binary_system_(astronomy)" class="mw-redirect" title="Binary system (astronomy)">binary system</a> with Pluto, as the two bodies orbit a <a href="Barycenter" class="mw-redirect" title="Barycenter">barycenter</a> of gravity above their surfaces (i.e. they appear to "orbit each other").</li></ul></li>
<li><a href="Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a> (30.3–48.1 AU), is in the same 2:3 orbital resonance with Neptune as Pluto, and is the largest such object after Pluto itself.<sup id="cite_ref-brownlargest_229-0" class="reference"><a href="#cite_note-brownlargest-229"><span class="cite-bracket">[</span>212<span class="cite-bracket">]</span></a></sup> Its eccentricity and inclination are similar to Pluto's, but its perihelion lies about 120° from that of Pluto. Thus, the <a href="Phase_(waves)#Phase_difference" title="Phase (waves)">phase</a> of Orcus's orbit is opposite to Pluto's: Orcus is at aphelion (most recently in 2019) around when Pluto is at perihelion (most recently in 1989) and vice versa.<sup id="cite_ref-MPC2004-D15_230-0" class="reference"><a href="#cite_note-MPC2004-D15-230"><span class="cite-bracket">[</span>213<span class="cite-bracket">]</span></a></sup> For this reason, it has been called the <i>anti-Pluto</i>.<sup id="cite_ref-MBP_231-0" class="reference"><a href="#cite_note-MBP-231"><span class="cite-bracket">[</span>214<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-232" class="reference"><a href="#cite_note-232"><span class="cite-bracket">[</span>215<span class="cite-bracket">]</span></a></sup> It has one known moon, <a href="Vanth_(moon)" title="Vanth (moon)">Vanth</a>.<sup id="cite_ref-IAUC8812_233-0" class="reference"><a href="#cite_note-IAUC8812-233"><span class="cite-bracket">[</span>216<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Haumea" title="Haumea">Haumea</a> (34.6–51.6 AU) was discovered in 2005.<sup id="cite_ref-234" class="reference"><a href="#cite_note-234"><span class="cite-bracket">[</span>217<span class="cite-bracket">]</span></a></sup> It is in a temporary 7:12 orbital resonance with Neptune.<sup id="cite_ref-brownlargest_229-1" class="reference"><a href="#cite_note-brownlargest-229"><span class="cite-bracket">[</span>212<span class="cite-bracket">]</span></a></sup> Haumea possesses a ring system, two known moons named <a href="Hi%CA%BBiaka_(moon)" title="Hiʻiaka (moon)">Hiʻiaka</a> and <a href="Namaka_(moon)" title="Namaka (moon)">Namaka</a>, and rotates so quickly (once every 3.9 hours) that it is stretched into an <a href="Ellipsoid" title="Ellipsoid">ellipsoid</a>. It is part of a <a href="Collisional_family" title="Collisional family">collisional family</a> of Kuiper belt objects that share similar orbits, which suggests a giant impact on Haumea ejected fragments into space billions of years ago.<sup id="cite_ref-Noviello2022_235-0" class="reference"><a href="#cite_note-Noviello2022-235"><span class="cite-bracket">[</span>218<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Makemake" title="Makemake">Makemake</a> (38.1–52.8 AU), although smaller than Pluto, is the largest known object in the <i>classical</i> Kuiper belt (that is, a Kuiper belt object not in a confirmed resonance with Neptune). Makemake is the brightest object in the Kuiper belt after Pluto. Discovered in 2005, it was officially named in 2009.<sup id="cite_ref-236" class="reference"><a href="#cite_note-236"><span class="cite-bracket">[</span>219<span class="cite-bracket">]</span></a></sup> Its orbit is far more inclined than Pluto's, at 29°.<sup id="cite_ref-Buie136472_237-0" class="reference"><a href="#cite_note-Buie136472-237"><span class="cite-bracket">[</span>220<span class="cite-bracket">]</span></a></sup> It has one known moon, <a href="S/2015_(136472)_1" title="S/2015 (136472) 1">S/2015 (136472) 1</a>.<sup id="cite_ref-ParkerA2016_238-0" class="reference"><a href="#cite_note-ParkerA2016-238"><span class="cite-bracket">[</span>221<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Quaoar" title="Quaoar">Quaoar</a> (41.9–45.5 AU) is the second-largest known object in the classical Kuiper belt, after Makemake. Its orbit is significantly less eccentric and inclined than those of Makemake or Haumea.<sup id="cite_ref-brownlargest_229-2" class="reference"><a href="#cite_note-brownlargest-229"><span class="cite-bracket">[</span>212<span class="cite-bracket">]</span></a></sup> It possesses a ring system and one known moon, <a href="Weywot_(moon)" class="mw-redirect" title="Weywot (moon)">Weywot</a>.<sup id="cite_ref-Morgado2023_239-0" class="reference"><a href="#cite_note-Morgado2023-239"><span class="cite-bracket">[</span>222<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading3"><h3 id="Scattered_disc">Scattered disc</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Scattered_disc" title="Scattered disc">Scattered disc</a></div>
<p>The scattered disc, which overlaps the Kuiper belt but extends out to near 500 AU, is thought to be the source of short-period comets. Scattered-disc objects are believed to have been perturbed into erratic orbits by the gravitational influence of <a href="Formation_and_evolution_of_the_Solar_System#Planetary_migration" title="Formation and evolution of the Solar System">Neptune's early outward migration</a>. Most scattered disc objects have perihelia within the Kuiper belt but aphelia far beyond it (some more than 150 AU from the Sun). SDOs' orbits can be inclined up to 46.8° from the ecliptic plane.<sup id="cite_ref-240" class="reference"><a href="#cite_note-240"><span class="cite-bracket">[</span>223<span class="cite-bracket">]</span></a></sup> Some astronomers consider the scattered disc to be merely another region of the Kuiper belt and describe scattered-disc objects as "scattered Kuiper belt objects".<sup id="cite_ref-241" class="reference"><a href="#cite_note-241"><span class="cite-bracket">[</span>224<span class="cite-bracket">]</span></a></sup> Some astronomers classify centaurs as inward-scattered Kuiper belt objects along with the outward-scattered residents of the scattered disc.<sup id="cite_ref-242" class="reference"><a href="#cite_note-242"><span class="cite-bracket">[</span>225<span class="cite-bracket">]</span></a></sup>
</p><p>Currently, there is strong consensus among astronomers that two of the bodies in the scattered disc are <span class="vanchor"><span class="vanchor-text">dwarf planets</span></span>:
</p>
<ul><li><a href="Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a> (38.3–97.5 AU) is the largest known scattered disc object and the most massive known dwarf planet. Eris's discovery contributed to a debate about the definition of a planet because it is 25% more massive than Pluto<sup id="cite_ref-Brown_Schaller_2007_243-0" class="reference"><a href="#cite_note-Brown_Schaller_2007-243"><span class="cite-bracket">[</span>226<span class="cite-bracket">]</span></a></sup> and about the same diameter. It has one known moon, <a href="Dysnomia_(moon)" title="Dysnomia (moon)">Dysnomia</a>. Like Pluto, its orbit is highly eccentric, with a perihelion of 38.2 AU (roughly Pluto's distance from the Sun) and an aphelion of 97.6 AU, and steeply inclined to the ecliptic plane at an angle of 44°.<sup id="cite_ref-244" class="reference"><a href="#cite_note-244"><span class="cite-bracket">[</span>227<span class="cite-bracket">]</span></a></sup></li>
<li><a href="Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a> (33.8–101.2 AU) is a dwarf planet in a comparable orbit to Eris, except that it is in a 3:10 resonance with Neptune.<sup id="cite_ref-jpldata_245-0" class="reference"><a href="#cite_note-jpldata-245"><span class="cite-bracket">[</span>D 10<span class="cite-bracket">]</span></a></sup> It has one known moon, <a href="Xiangliu_(moon)" title="Xiangliu (moon)">Xiangliu</a>.<sup id="cite_ref-Kissetal2017_246-0" class="reference"><a href="#cite_note-Kissetal2017-246"><span class="cite-bracket">[</span>228<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading3"><h3 id="Extreme_trans-Neptunian_objects">Extreme trans-Neptunian objects</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Extreme_trans-Neptunian_object" title="Extreme trans-Neptunian object">Extreme trans-Neptunian object</a></div>
<p>Some objects in the Solar System have a very large orbit, and therefore are much less affected by the known giant planets than other minor planet populations. These bodies are called extreme trans-Neptunian objects, or ETNOs for short.<sup id="cite_ref-Sheppard-2018_247-0" class="reference"><a href="#cite_note-Sheppard-2018-247"><span class="cite-bracket">[</span>229<span class="cite-bracket">]</span></a></sup> Generally, ETNOs' <a href="Semi-major_axis" class="mw-redirect" title="Semi-major axis">semi-major axes</a> are at least 150–250 AU wide.<sup id="cite_ref-Sheppard-2018_247-1" class="reference"><a href="#cite_note-Sheppard-2018-247"><span class="cite-bracket">[</span>229<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Caju_outlier_248-0" class="reference"><a href="#cite_note-Caju_outlier-248"><span class="cite-bracket">[</span>230<span class="cite-bracket">]</span></a></sup> For example, <a href="541132_Lele%C4%81k%C5%ABhonua" title="541132 Leleākūhonua">541132 Leleākūhonua</a> orbits the Sun once every ~32,000 years, with a distance of 65–2000 AU from the Sun.<sup id="cite_ref-jpldata2_249-0" class="reference"><a href="#cite_note-jpldata2-249"><span class="cite-bracket">[</span>D 11<span class="cite-bracket">]</span></a></sup>
</p><p>This population is divided into three subgroups by astronomers. The <a href="Scattered_disc_object" class="mw-redirect" title="Scattered disc object">scattered</a> ETNOs have <a href="Perihelia" class="mw-redirect" title="Perihelia">perihelia</a> around 38–45 AU and an exceptionally high <a href="Orbital_eccentricity" title="Orbital eccentricity">eccentricity</a> of more than 0.85. As with the regular scattered disc objects, they were likely formed as result of <a href="Planetary_migration#Gravitational_scattering" title="Planetary migration">gravitational scattering</a> by Neptune and still interact with the giant planets. The <a href="Detached_object" title="Detached object">detached</a> ETNOs, with perihelia approximately between 40–45 and 50–60 AU, are less affected by Neptune than the scattered ETNOs, but are still relatively close to Neptune. The <a href="Sednoid" title="Sednoid">sednoids</a> or <a href="Hills_Cloud" class="mw-redirect" title="Hills Cloud">inner Oort cloud</a> objects, with perihelia beyond 50–60 AU, are too far from Neptune to be strongly influenced by it.<sup id="cite_ref-Sheppard-2018_247-2" class="reference"><a href="#cite_note-Sheppard-2018-247"><span class="cite-bracket">[</span>229<span class="cite-bracket">]</span></a></sup>
</p><p>Currently, there is one ETNO that is classified as a dwarf planet:
</p>
<ul><li><a href="Sedna_(dwarf_planet)" title="Sedna (dwarf planet)">Sedna</a> (76.2–937 AU) was the first extreme trans-Neptunian object to be discovered. It is a large, reddish object, and takes ~11,400 years to complete one orbit. <a href="Michael_E._Brown" title="Michael E. Brown">Mike Brown</a>, who discovered the object in 2003, asserts that it cannot be part of the scattered disc or the Kuiper belt because its perihelion is too distant to have been affected by Neptune's migration.<sup id="cite_ref-250" class="reference"><a href="#cite_note-250"><span class="cite-bracket">[</span>231<span class="cite-bracket">]</span></a></sup> The <a href="Sednoid" title="Sednoid">sednoid population</a> is named after Sedna.<sup id="cite_ref-Sheppard-2018_247-3" class="reference"><a href="#cite_note-Sheppard-2018-247"><span class="cite-bracket">[</span>229<span class="cite-bracket">]</span></a></sup></li></ul>
<div class="mw-heading mw-heading3"><h3 id="Edge_of_the_heliosphere">Edge of the heliosphere</h3></div>
<p>The Sun's <a href="Stellar-wind_bubble" title="Stellar-wind bubble">stellar-wind bubble</a>, the <a href="Heliosphere" title="Heliosphere">heliosphere</a>, a region of space dominated by the Sun, has its boundary at the <i>termination shock</i>. Based on the Sun's <a href="Peculiar_motion" class="mw-redirect" title="Peculiar motion">peculiar motion</a> relative to the <a href="Local_standard_of_rest" title="Local standard of rest">local standard of rest</a>, this boundary is roughly 80–100 AU from the Sun upwind of the interstellar medium and roughly 200 AU from the Sun downwind.<sup id="cite_ref-fahr_251-0" class="reference"><a href="#cite_note-fahr-251"><span class="cite-bracket">[</span>232<span class="cite-bracket">]</span></a></sup> Here the solar wind collides with the interstellar medium<sup id="cite_ref-252" class="reference"><a href="#cite_note-252"><span class="cite-bracket">[</span>233<span class="cite-bracket">]</span></a></sup> and dramatically slows, condenses and becomes more turbulent, forming a great oval structure known as the <a href="Heliosheath" class="mw-redirect" title="Heliosheath">heliosheath</a>.<sup id="cite_ref-fahr_251-1" class="reference"><a href="#cite_note-fahr-251"><span class="cite-bracket">[</span>232<span class="cite-bracket">]</span></a></sup>
</p><p>The heliosheath has been theorized to look and behave very much like a comet's tail, extending outward for a further 40 AU on the upwind side but tailing many times that distance downwind to possibly several thousands of AU.<sup id="cite_ref-n092_253-0" class="reference"><a href="#cite_note-n092-253"><span class="cite-bracket">[</span>234<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-254" class="reference"><a href="#cite_note-254"><span class="cite-bracket">[</span>235<span class="cite-bracket">]</span></a></sup> Evidence from the <i><a href="Cassini_(spacecraft)" class="mw-redirect" title="Cassini (spacecraft)">Cassini</a></i> and <a href="Interstellar_Boundary_Explorer" title="Interstellar Boundary Explorer">Interstellar Boundary Explorer</a> spacecraft has suggested that it is forced into a bubble shape by the constraining action of the interstellar magnetic field,<sup id="cite_ref-255" class="reference"><a href="#cite_note-255"><span class="cite-bracket">[</span>236<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-256" class="reference"><a href="#cite_note-256"><span class="cite-bracket">[</span>237<span class="cite-bracket">]</span></a></sup> but the actual shape remains unknown.<sup id="cite_ref-257" class="reference"><a href="#cite_note-257"><span class="cite-bracket">[</span>238<span class="cite-bracket">]</span></a></sup>
</p><p>The shape and form of the outer edge of the heliosphere is likely affected by the <a href="Fluid_dynamics" title="Fluid dynamics">fluid dynamics</a> of interactions with the interstellar medium as well as <a href="Solar_magnetic_field" class="mw-redirect" title="Solar magnetic field">solar magnetic fields</a> prevailing to the south, e.g. it is bluntly shaped with the northern hemisphere extending 9 AU farther than the southern hemisphere.<sup id="cite_ref-fahr_251-2" class="reference"><a href="#cite_note-fahr-251"><span class="cite-bracket">[</span>232<span class="cite-bracket">]</span></a></sup> The heliopause is considered the beginning of the interstellar medium.<sup id="cite_ref-Voyager_102-1" class="reference"><a href="#cite_note-Voyager-102"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup> Beyond the heliopause, at around 230 AU, lies the <a href="Bow_shock" title="Bow shock">bow shock</a>: a plasma "wake" left by the Sun as it travels through the Milky Way.<sup id="cite_ref-258" class="reference"><a href="#cite_note-258"><span class="cite-bracket">[</span>239<span class="cite-bracket">]</span></a></sup> Large objects outside the heliopause remain gravitationally bound to the Sun, but the flow of matter in the interstellar medium homogenizes the distribution of micro-scale objects.<sup id="cite_ref-Voyager_102-2" class="reference"><a href="#cite_note-Voyager-102"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Miscellaneous_populations">Miscellaneous populations</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Comets">Comets</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Comet" title="Comet">Comet</a></div>
<p>Comets are <a href="Small_Solar_System_bodies" class="mw-redirect" title="Small Solar System bodies">small Solar System bodies</a>, typically only a few kilometers across, composed largely of volatile ices. They have highly eccentric orbits, generally a perihelion within the orbits of the inner planets and an aphelion far beyond Pluto. When a comet enters the inner Solar System, its proximity to the Sun causes its icy surface to <a href="Sublimation_(chemistry)" class="mw-redirect" title="Sublimation (chemistry)">sublimate</a> and <a href="Ion" title="Ion">ionise</a>, creating a <a href="Coma_(cometary)" class="mw-redirect" title="Coma (cometary)">coma</a>: a long tail of gas and dust often visible to the naked eye.<sup id="cite_ref-259" class="reference"><a href="#cite_note-259"><span class="cite-bracket">[</span>240<span class="cite-bracket">]</span></a></sup>
</p><p>Short-period comets have orbits lasting less than two hundred years. Long-period comets have orbits lasting thousands of years. Short-period comets are thought to originate in the Kuiper belt, whereas long-period comets, such as <a href="Comet_Hale%E2%80%93Bopp" title="Comet Hale–Bopp">Hale–Bopp</a>, are thought to originate in the Oort cloud. Many comet groups, such as the <a href="Kreutz_sungrazer" title="Kreutz sungrazer">Kreutz sungrazers</a>, formed from the breakup of a single parent.<sup id="cite_ref-260" class="reference"><a href="#cite_note-260"><span class="cite-bracket">[</span>241<span class="cite-bracket">]</span></a></sup> Some comets with <a href="Hyperbolic_trajectory" title="Hyperbolic trajectory">hyperbolic</a> orbits may originate outside the Solar System, but determining their precise orbits is difficult.<sup id="cite_ref-hyperbolic_261-0" class="reference"><a href="#cite_note-hyperbolic-261"><span class="cite-bracket">[</span>242<span class="cite-bracket">]</span></a></sup> Old comets whose volatiles have mostly been driven out by solar warming are often categorized as asteroids.<sup id="cite_ref-262" class="reference"><a href="#cite_note-262"><span class="cite-bracket">[</span>243<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading3"><h3 id="Meteoroids,_meteors_and_dust">Meteoroids, meteors and dust</h3></div>
<div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="Meteoroid" title="Meteoroid">Meteoroid</a>, <a href="Interplanetary_dust_cloud" title="Interplanetary dust cloud">Interplanetary dust cloud</a>, and <a href="Cosmic_dust" title="Cosmic dust">Cosmic dust</a></div>
<p>Solid objects smaller than one meter are usually called meteoroids and micrometeoroids (grain-sized), with the exact division between the two categories being debated over the years.<sup id="cite_ref-263" class="reference"><a href="#cite_note-263"><span class="cite-bracket">[</span>244<span class="cite-bracket">]</span></a></sup> By 2017, the IAU designated any solid object having a diameter between ~30 <a href="Micrometre" title="Micrometre">micrometers</a> and 1 meter as meteoroids, and depreciated the micrometeoroid categorization, instead terms smaller particles simply as 'dust particles'.<sup id="cite_ref-264" class="reference"><a href="#cite_note-264"><span class="cite-bracket">[</span>245<span class="cite-bracket">]</span></a></sup>
</p><p>Some meteoroids formed via disintegration of comets and asteroids, while a few formed via impact debris ejected from planetary bodies. Most meteoroids are made of silicates and heavier metals like <a href="Nickel" title="Nickel">nickel</a> and <a href="Iron" title="Iron">iron</a>.<sup id="cite_ref-265" class="reference"><a href="#cite_note-265"><span class="cite-bracket">[</span>246<span class="cite-bracket">]</span></a></sup> When passing through the Solar System, comets produce a trail of meteoroids; it is hypothesized that this is caused either by vaporization of the comet's material or by simple breakup of dormant comets. When crossing an atmosphere, these meteoroids will produce bright streaks in the sky due to <a href="Atmospheric_entry" title="Atmospheric entry">atmospheric entry</a>, called <a href="Meteor" title="Meteor">meteors</a>. If a stream of meteoroids enter the atmosphere on parallel trajectories, the meteors will seemingly 'radiate' from a point in the sky, hence the phenomenon's name: <a href="Meteor_shower" title="Meteor shower">meteor shower</a>.<sup id="cite_ref-266" class="reference"><a href="#cite_note-266"><span class="cite-bracket">[</span>247<span class="cite-bracket">]</span></a></sup>
</p><p>The inner Solar System is home to the <a href="Interplanetary_dust_cloud" title="Interplanetary dust cloud">zodiacal dust cloud</a>, which is visible as the hazy <a href="Zodiacal_light" title="Zodiacal light">zodiacal light</a> in dark, unpolluted skies. It may be generated by collisions within the asteroid belt brought on by gravitational interactions with the planets; a more recent proposed origin is materials from planet Mars.<sup id="cite_ref-267" class="reference"><a href="#cite_note-267"><span class="cite-bracket">[</span>248<span class="cite-bracket">]</span></a></sup> The outer Solar System hosts a cosmic dust cloud. It extends from about <span class="nowrap">10 AU</span> to about <span class="nowrap">40 AU</span>, and was probably created by collisions within the Kuiper belt.<sup id="cite_ref-268" class="reference"><a href="#cite_note-268"><span class="cite-bracket">[</span>249<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-269" class="reference"><a href="#cite_note-269"><span class="cite-bracket">[</span>250<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Boundary_region_and_uncertainties">Boundary region and uncertainties</h2></div>
<div role="note" class="hatnote navigation-not-searchable">See also: <a href="Planets_beyond_Neptune" title="Planets beyond Neptune">Planets beyond Neptune</a>, <a href="Planet_Nine" title="Planet Nine">Planet Nine</a>, and <a href="List_of_Solar_System_objects_by_greatest_aphelion" title="List of Solar System objects by greatest aphelion">List of Solar System objects by greatest aphelion</a></div>
<p>Much of the outer Solar System is still unknown. The region beyond 100 AU away is virtually unexplored and learning about this region of space is difficult. Study of this region depends upon inferences from those few objects whose orbits happen to be perturbed such that they fall closer to the Sun, and even then, detecting these objects has often been possible only when they happened to become bright enough to register as comets.<sup id="cite_ref-270" class="reference"><a href="#cite_note-270"><span class="cite-bracket">[</span>251<span class="cite-bracket">]</span></a></sup> Many objects are yet to be discovered in the Solar System's outer region.<sup id="cite_ref-271" class="reference"><a href="#cite_note-271"><span class="cite-bracket">[</span>252<span class="cite-bracket">]</span></a></sup>
</p><p>The <a href="Oort_cloud" title="Oort cloud">Oort cloud</a> is a theorized spherical shell of up to a trillion icy objects that is thought to be the source for all long-period comets.<sup id="cite_ref-:5_272-0" class="reference"><a href="#cite_note-:5-272"><span class="cite-bracket">[</span>253<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:6_273-0" class="reference"><a href="#cite_note-:6-273"><span class="cite-bracket">[</span>254<span class="cite-bracket">]</span></a></sup> No direct observation of the Oort cloud is possible with present imaging technology.<sup id="cite_ref-274" class="reference"><a href="#cite_note-274"><span class="cite-bracket">[</span>255<span class="cite-bracket">]</span></a></sup> It is theorized to surround the Solar System at roughly 50,000 AU (~0.9 <a href="Light-year" title="Light-year">ly</a>) from the Sun and possibly to as far as 100,000 AU (~1.8 ly). The Oort cloud is thought to be composed of comets that were ejected from the inner Solar System by gravitational interactions with the outer planets. Oort cloud objects move very slowly, and can be perturbed by infrequent events, such as collisions, the gravitational effects of a passing star, or the <a href="Galactic_tide" title="Galactic tide">galactic tide</a>, the <a href="Tidal_force" title="Tidal force">tidal force</a> exerted by the Milky Way.<sup id="cite_ref-:5_272-1" class="reference"><a href="#cite_note-:5-272"><span class="cite-bracket">[</span>253<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:6_273-1" class="reference"><a href="#cite_note-:6-273"><span class="cite-bracket">[</span>254<span class="cite-bracket">]</span></a></sup>
</p><p>As of the 2020s, a few astronomers have hypothesized that <a href="Planet_Nine" title="Planet Nine">Planet Nine</a> (a planet beyond Neptune) might exist, based on statistical variance in the orbit of <a href="Extreme_trans-Neptunian_object" title="Extreme trans-Neptunian object">extreme trans-Neptunian objects</a>.<sup id="cite_ref-P9H2019_275-0" class="reference"><a href="#cite_note-P9H2019-275"><span class="cite-bracket">[</span>256<span class="cite-bracket">]</span></a></sup> Their closest approaches to the Sun are mostly clustered around one sector and their orbits are similarly tilted, suggesting that a large planet might be influencing their orbit over millions of years.<sup id="cite_ref-Sheppard2014_276-0" class="reference"><a href="#cite_note-Sheppard2014-276"><span class="cite-bracket">[</span>257<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-nodes-2021_277-0" class="reference"><a href="#cite_note-nodes-2021-277"><span class="cite-bracket">[</span>258<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-nodes-2022_278-0" class="reference"><a href="#cite_note-nodes-2022-278"><span class="cite-bracket">[</span>259<span class="cite-bracket">]</span></a></sup> However, some astronomers said that this observation might be credited to observational biases or just sheer coincidence.<sup id="cite_ref-279" class="reference"><a href="#cite_note-279"><span class="cite-bracket">[</span>260<span class="cite-bracket">]</span></a></sup> An alternative hypothesis has a close flyby of another star disrupting the outer Solar System.<sup id="cite_ref-280" class="reference"><a href="#cite_note-280"><span class="cite-bracket">[</span>261<span class="cite-bracket">]</span></a></sup>
</p><p>The Sun's gravitational field is estimated to <a href="Sphere_of_influence_(astrodynamics)" title="Sphere of influence (astrodynamics)">dominate the gravitational forces of surrounding stars</a> out to about two light-years (<span class="nowrap">125,000 AU</span>). Lower estimates for the radius of the Oort cloud, by contrast, do not place it farther than <span class="nowrap">50,000 AU</span>.<sup id="cite_ref-Encrenaz_et_al_2004_281-0" class="reference"><a href="#cite_note-Encrenaz_et_al_2004-281"><span class="cite-bracket">[</span>262<span class="cite-bracket">]</span></a></sup> Most of the mass is orbiting in the region between 3,000 and <span class="nowrap">100,000 AU</span>.<sup id="cite_ref-282" class="reference"><a href="#cite_note-282"><span class="cite-bracket">[</span>263<span class="cite-bracket">]</span></a></sup> The furthest known objects, such as <a href="Comet_West" class="mw-redirect" title="Comet West">Comet West</a>, have aphelia around <span class="nowrap">70,000 AU</span> from the Sun.<sup id="cite_ref-283" class="reference"><a href="#cite_note-283"><span class="cite-bracket">[</span>264<span class="cite-bracket">]</span></a></sup> The Sun's <a href="Hill_sphere" title="Hill sphere">Hill sphere</a> with respect to the galactic nucleus, the effective range of its gravitational influence, is thought to extend up to a thousand times farther and encompasses the hypothetical Oort cloud.<sup id="cite_ref-Littmann_284-0" class="reference"><a href="#cite_note-Littmann-284"><span class="cite-bracket">[</span>265<span class="cite-bracket">]</span></a></sup> It was calculated by G. A. Chebotarev to be 230,000 AU.<sup id="cite_ref-Chebotarev_14-1" class="reference"><a href="#cite_note-Chebotarev-14"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Celestial_neighborhood">Celestial neighborhood</h2></div>
<div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="List_of_nearest_stars" title="List of nearest stars">List of nearest stars</a>, <a href="List_of_nearest_exoplanets" title="List of nearest exoplanets">List of nearest exoplanets</a>, and <a href="List_of_nearby_stellar_associations_and_moving_groups" title="List of nearby stellar associations and moving groups">List of nearby stellar associations and moving groups</a></div>
<p>Within 10 light-years of the Sun there are relatively few stars, the closest being the triple star system <a href="Alpha_Centauri" title="Alpha Centauri">Alpha Centauri</a>, which is about 4.4 light-years away and may be in the Local Bubble's <a href="G-Cloud" title="G-Cloud">G-Cloud</a>.<sup id="cite_ref-286" class="reference"><a href="#cite_note-286"><span class="cite-bracket">[</span>267<span class="cite-bracket">]</span></a></sup> Alpha Centauri A and B are a closely tied pair of <a href="Solar_analog" title="Solar analog">Sun-like stars</a>, whereas the closest star to the Sun, the small <a href="Red_dwarf" title="Red dwarf">red dwarf</a> <a href="Proxima_Centauri" title="Proxima Centauri">Proxima Centauri</a>, orbits the pair at a distance of 0.2 light-years. In 2016, a potentially habitable <a href="Exoplanet" title="Exoplanet">exoplanet</a> was found to be orbiting Proxima Centauri, called <a href="Proxima_Centauri_b" title="Proxima Centauri b">Proxima Centauri b</a>, the closest confirmed exoplanet to the Sun.<sup id="cite_ref-proxima_b_discovery_paper_287-0" class="reference"><a href="#cite_note-proxima_b_discovery_paper-287"><span class="cite-bracket">[</span>268<span class="cite-bracket">]</span></a></sup>
</p><p>The Solar System is surrounded by the <a href="Local_Interstellar_Cloud" title="Local Interstellar Cloud">Local Interstellar Cloud</a>, although it is not clear if it is embedded in the Local Interstellar Cloud or if it lies just outside the cloud's edge.<sup id="cite_ref-:1_288-0" class="reference"><a href="#cite_note-:1-288"><span class="cite-bracket">[</span>269<span class="cite-bracket">]</span></a></sup> Multiple other <a href="Interstellar_cloud" title="Interstellar cloud">interstellar clouds</a> exist in the region within 300 light-years of the Sun, known as the <a href="Local_Bubble" title="Local Bubble">Local Bubble</a>.<sup id="cite_ref-:1_288-1" class="reference"><a href="#cite_note-:1-288"><span class="cite-bracket">[</span>269<span class="cite-bracket">]</span></a></sup> The latter feature is an hourglass-shaped cavity or <a href="Superbubble" title="Superbubble">superbubble</a> in the interstellar medium roughly 300 light-years across. The bubble is suffused with high-temperature plasma, suggesting that it may be the product of several recent supernovae.<sup id="cite_ref-289" class="reference"><a href="#cite_note-289"><span class="cite-bracket">[</span>270<span class="cite-bracket">]</span></a></sup>
</p><p>The Local Bubble is a small superbubble compared to the neighboring wider <a href="Radcliffe_Wave" class="mw-redirect" title="Radcliffe Wave">Radcliffe Wave</a> and <i>Split</i> linear structures (formerly <a href="Gould_Belt" title="Gould Belt">Gould Belt</a>), each of which are some thousands of light-years in length.<sup id="cite_ref-Alves_Zucker_Goodman_Speagle_2020_290-0" class="reference"><a href="#cite_note-Alves_Zucker_Goodman_Speagle_2020-290"><span class="cite-bracket">[</span>271<span class="cite-bracket">]</span></a></sup> All these structures are part of the <a href="Orion_Arm" title="Orion Arm">Orion Arm</a>, which contains most of the stars in the Milky Way that are visible to the unaided eye.<sup id="cite_ref-291" class="reference"><a href="#cite_note-291"><span class="cite-bracket">[</span>272<span class="cite-bracket">]</span></a></sup>
</p><p>Groups of stars form together in <a href="Star_cluster" title="Star cluster">star clusters</a>, before dissolving into co-moving associations. A prominent grouping that is visible to the naked eye is the <a href="Ursa_Major_moving_group" title="Ursa Major moving group">Ursa Major moving group</a>, which is around 80 light-years away within the Local Bubble. The nearest star cluster is <a href="Hyades_(star_cluster)" title="Hyades (star cluster)">Hyades</a>, which lies at the edge of the Local Bubble. The closest star-forming regions are the <a href="Corona_Australis_Molecular_Cloud" class="mw-redirect" title="Corona Australis Molecular Cloud">Corona Australis Molecular Cloud</a>, the <a href="Rho_Ophiuchi_cloud_complex" title="Rho Ophiuchi cloud complex">Rho Ophiuchi cloud complex</a> and the <a href="Taurus_molecular_cloud" title="Taurus molecular cloud">Taurus molecular cloud</a>; the latter lies just beyond the Local Bubble and is part of the Radcliffe wave.<sup id="cite_ref-292" class="reference"><a href="#cite_note-292"><span class="cite-bracket">[</span>273<span class="cite-bracket">]</span></a></sup>
</p><p>Stellar flybys that pass within 0.8 light-years of the Sun occur roughly once every 100,000 years. The <a href="List_of_nearest_stars#Distant_future_and_past_encounters" title="List of nearest stars">closest well-measured approach</a> was <a href="Scholz's_Star" title="Scholz's Star">Scholz's Star</a>, which approached to ~<span class="nowrap">50,000 AU</span> of the Sun some ~70 thousands years ago, likely passing through the outer Oort cloud.<sup id="cite_ref-293" class="reference"><a href="#cite_note-293"><span class="cite-bracket">[</span>274<span class="cite-bracket">]</span></a></sup> There is a 1% chance every billion years that a star will pass within <span class="nowrap">100 AU</span> of the Sun, potentially disrupting the Solar System.<sup id="cite_ref-Raymond_et_al_2024_294-0" class="reference"><a href="#cite_note-Raymond_et_al_2024-294"><span class="cite-bracket">[</span>275<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Galactic_position">Galactic position</h2></div>
<div role="note" class="hatnote navigation-not-searchable">See also: <a href="Location_of_Earth" title="Location of Earth">Location of Earth</a>, <a href="Galactic_year" title="Galactic year">Galactic year</a>, and <a href="Orbit_of_the_Sun" class="mw-redirect" title="Orbit of the Sun">Orbit of the Sun</a></div>
<p>The Solar System is located in the <a href="Milky_Way" title="Milky Way">Milky Way</a>, a <a href="Barred_spiral_galaxy" title="Barred spiral galaxy">barred spiral galaxy</a> with a diameter of about 100,000 <a href="Light-year" title="Light-year">light-years</a> containing more than 100 billion stars.<sup id="cite_ref-Lang2013_295-0" class="reference"><a href="#cite_note-Lang2013-295"><span class="cite-bracket">[</span>276<span class="cite-bracket">]</span></a></sup> The Sun is part of one of the Milky Way's outer spiral arms, known as the <a href="Orion%E2%80%93Cygnus_Arm" class="mw-redirect" title="Orion–Cygnus Arm">Orion–Cygnus Arm</a> or Local Spur.<sup id="cite_ref-296" class="reference"><a href="#cite_note-296"><span class="cite-bracket">[</span>277<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-297" class="reference"><a href="#cite_note-297"><span class="cite-bracket">[</span>278<span class="cite-bracket">]</span></a></sup> It is a member of the <a href="Thin_disk" title="Thin disk">thin disk</a> population of stars orbiting close to the galactic plane.<sup id="cite_ref-298" class="reference"><a href="#cite_note-298"><span class="cite-bracket">[</span>279<span class="cite-bracket">]</span></a></sup>
</p><p>Its speed around the center of the Milky Way is about 220 km/s, so that it completes one revolution every 240 million years.<sup id="cite_ref-Lang2013_295-1" class="reference"><a href="#cite_note-Lang2013-295"><span class="cite-bracket">[</span>276<span class="cite-bracket">]</span></a></sup> This revolution is known as the Solar System's <a href="Galactic_year" title="Galactic year">galactic year</a>.<sup id="cite_ref-299" class="reference"><a href="#cite_note-299"><span class="cite-bracket">[</span>280<span class="cite-bracket">]</span></a></sup> The <a href="Solar_apex" title="Solar apex">solar apex</a>, the direction of the Sun's path through interstellar space, is near the constellation <a href="Hercules_(constellation)" title="Hercules (constellation)">Hercules</a> in the direction of the current location of the bright star <a href="Vega" title="Vega">Vega</a>.<sup id="cite_ref-300" class="reference"><a href="#cite_note-300"><span class="cite-bracket">[</span>281<span class="cite-bracket">]</span></a></sup> The plane of the ecliptic lies at an angle of about 60° to the <a href="Galactic_plane" title="Galactic plane">galactic plane</a>.<sup id="cite_ref-angle_16-1" class="reference"><a href="#cite_note-angle-16"><span class="cite-bracket">[</span>c<span class="cite-bracket">]</span></a></sup>
</p><p>The Sun follows a nearly circular orbit around the <a href="Galactic_Center" title="Galactic Center">Galactic Center</a> (where the <a href="Supermassive_black_hole" title="Supermassive black hole">supermassive black hole</a> <a href="Sagittarius_A*" title="Sagittarius A*">Sagittarius A*</a> resides) at a distance of 26,660 light-years,<sup id="cite_ref-302" class="reference"><a href="#cite_note-302"><span class="cite-bracket">[</span>283<span class="cite-bracket">]</span></a></sup> orbiting at roughly the same speed as that of the spiral arms.<sup id="cite_ref-astrobiology_303-0" class="reference"><a href="#cite_note-astrobiology-303"><span class="cite-bracket">[</span>284<span class="cite-bracket">]</span></a></sup> If it orbited close to the center, gravitational tugs from nearby stars could perturb bodies in the <a href="#Oort_cloud">Oort cloud</a> and send many comets into the inner Solar System, producing collisions with potentially catastrophic implications for life on Earth. In this scenario, the intense radiation of the Galactic Center could interfere with the development of complex life.<sup id="cite_ref-astrobiology_303-1" class="reference"><a href="#cite_note-astrobiology-303"><span class="cite-bracket">[</span>284<span class="cite-bracket">]</span></a></sup>
</p><p>The Solar System's location in the Milky Way is a factor in the <a href="Evolutionary_history_of_life" class="mw-redirect" title="Evolutionary history of life">evolutionary history of life</a> on Earth. Spiral arms are home to a far larger concentration of <a href="Supernova" title="Supernova">supernovae</a>, gravitational instabilities, and radiation that could disrupt the Solar System, but since Earth stays in the Local Spur and therefore does not pass frequently through spiral arms, this has given Earth long periods of stability for life to evolve.<sup id="cite_ref-astrobiology_303-2" class="reference"><a href="#cite_note-astrobiology-303"><span class="cite-bracket">[</span>284<span class="cite-bracket">]</span></a></sup> However, according to the controversial <a href="Shiva_hypothesis" title="Shiva hypothesis">Shiva hypothesis</a>, the changing position of the Solar System relative to other parts of the Milky Way could explain periodic <a href="Extinction_events" class="mw-redirect" title="Extinction events">extinction events</a> on Earth.<sup id="cite_ref-304" class="reference"><a href="#cite_note-304"><span class="cite-bracket">[</span>285<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-305" class="reference"><a href="#cite_note-305"><span class="cite-bracket">[</span>286<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Discovery_and_exploration">Discovery and exploration</h2></div>
<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Discovery_and_exploration_of_the_Solar_System" title="Discovery and exploration of the Solar System">Discovery and exploration of the Solar System</a></div>
<p>Humanity's knowledge of the Solar System has grown incrementally over the centuries. Up to the <a href="Late_Middle_Ages" title="Late Middle Ages">Late Middle Ages</a>–<a href="Renaissance" title="Renaissance">Renaissance</a>, astronomers from Europe to India believed Earth to <a href="Geocentrism" title="Geocentrism">be stationary at the center</a> of the universe<sup id="cite_ref-306" class="reference"><a href="#cite_note-306"><span class="cite-bracket">[</span>287<span class="cite-bracket">]</span></a></sup> and categorically different from the divine or ethereal objects that moved through the sky. Although the <a href="Ancient_Greece" title="Ancient Greece">Greek</a> philosopher <a href="Aristarchus_of_Samos" title="Aristarchus of Samos">Aristarchus of Samos</a> had speculated on a <a href="Heliocentric" class="mw-redirect" title="Heliocentric">heliocentric</a> reordering of the cosmos, <a href="Nicolaus_Copernicus" title="Nicolaus Copernicus">Nicolaus Copernicus</a> was the first person known to have developed <a href="Copernican_heliocentrism" title="Copernican heliocentrism">a mathematically predictive heliocentric system</a>.<sup id="cite_ref-307" class="reference"><a href="#cite_note-307"><span class="cite-bracket">[</span>288<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-308" class="reference"><a href="#cite_note-308"><span class="cite-bracket">[</span>289<span class="cite-bracket">]</span></a></sup>
</p><p>Heliocentrism did not triumph immediately over geocentrism, but the work of Copernicus had its champions, notably <a href="Johannes_Kepler" title="Johannes Kepler">Johannes Kepler</a>. Using a heliocentric model that improved upon Copernicus by allowing orbits to be elliptical, and the precise observational data of <a href="Tycho_Brahe" title="Tycho Brahe">Tycho Brahe</a>, Kepler produced the <i><a href="Rudolphine_Tables" title="Rudolphine Tables">Rudolphine Tables</a></i>, which enabled accurate computations of the positions of the then-known planets. <a href="Pierre_Gassendi" title="Pierre Gassendi">Pierre Gassendi</a> used them to predict a <a href="Transit_of_Mercury" title="Transit of Mercury">transit of Mercury</a> in 1631, and <a href="Jeremiah_Horrocks" title="Jeremiah Horrocks">Jeremiah Horrocks</a> did the same for a <a href="Transit_of_Venus" title="Transit of Venus">transit of Venus</a> in 1639. This provided a strong vindication of heliocentrism and Kepler's elliptical orbits.<sup id="cite_ref-309" class="reference"><a href="#cite_note-309"><span class="cite-bracket">[</span>290<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-310" class="reference"><a href="#cite_note-310"><span class="cite-bracket">[</span>291<span class="cite-bracket">]</span></a></sup>
</p><p>In the 17th century, <a href="Galileo_Galilei" title="Galileo Galilei">Galileo</a> publicized the use of the telescope in astronomy; he and <a href="Simon_Marius" title="Simon Marius">Simon Marius</a> independently discovered that Jupiter had four satellites in orbit around it.<sup id="cite_ref-311" class="reference"><a href="#cite_note-311"><span class="cite-bracket">[</span>292<span class="cite-bracket">]</span></a></sup> <a href="Christiaan_Huygens" title="Christiaan Huygens">Christiaan Huygens</a> followed on from these observations by discovering Saturn's moon <a href="Titan_(moon)" title="Titan (moon)">Titan</a> and the shape of the <a href="Rings_of_Saturn" title="Rings of Saturn">rings of Saturn</a>.<sup id="cite_ref-312" class="reference"><a href="#cite_note-312"><span class="cite-bracket">[</span>293<span class="cite-bracket">]</span></a></sup> In 1677, <a href="Edmond_Halley" title="Edmond Halley">Edmond Halley</a> observed a transit of Mercury across the Sun, leading him to realize that observations of the <a href="Solar_parallax" class="mw-redirect" title="Solar parallax">solar parallax</a> of a planet (more ideally using the transit of Venus) could be used to <a href="Trigonometry" title="Trigonometry">trigonometrically</a> determine the distances between Earth, <a href="Venus" title="Venus">Venus</a>, and the Sun.<sup id="cite_ref-313" class="reference"><a href="#cite_note-313"><span class="cite-bracket">[</span>294<span class="cite-bracket">]</span></a></sup> Halley's friend <a href="Isaac_Newton" title="Isaac Newton">Isaac Newton</a>, in his magisterial <i><a href="Philosophi%C3%A6_Naturalis_Principia_Mathematica" title="Philosophiæ Naturalis Principia Mathematica">Principia Mathematica</a></i> of 1687, demonstrated that celestial bodies are not quintessentially different from Earthly ones: the same <a href="Newton's_laws_of_motion" title="Newton's laws of motion">laws of motion</a> and of <a href="Newton's_law_of_universal_gravitation" title="Newton's law of universal gravitation">gravity</a> apply on Earth and in the skies.<sup id="cite_ref-:0_70-1" class="reference"><a href="#cite_note-:0-70"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page: 142">: 142 </span></sup>
</p>
<p>The term "Solar System" entered the English language by 1704, when <a href="John_Locke" title="John Locke">John Locke</a> used it to refer to the Sun, planets, and comets.<sup id="cite_ref-314" class="reference"><a href="#cite_note-314"><span class="cite-bracket">[</span>295<span class="cite-bracket">]</span></a></sup> In 1705, Halley realized that repeated sightings of <a href="Halley's_Comet" title="Halley's Comet">a comet</a> were of the same object, returning regularly once every 75–76 years. This was the first evidence that anything other than the planets repeatedly orbited the Sun,<sup id="cite_ref-315" class="reference"><a href="#cite_note-315"><span class="cite-bracket">[</span>296<span class="cite-bracket">]</span></a></sup> though <a href="Seneca_the_Younger" title="Seneca the Younger">Seneca</a> had theorized this about comets in the 1st century.<sup id="cite_ref-316" class="reference"><a href="#cite_note-316"><span class="cite-bracket">[</span>297<span class="cite-bracket">]</span></a></sup> Careful observations of the 1769 transit of Venus allowed astronomers to calculate the average Earth–Sun distance as 93,726,900 miles (150,838,800 km), only 0.8% greater than the modern value.<sup id="cite_ref-317" class="reference"><a href="#cite_note-317"><span class="cite-bracket">[</span>298<span class="cite-bracket">]</span></a></sup>
</p><p><a href="Uranus" title="Uranus">Uranus</a>, having occasionally been observed since 1690 and possibly from antiquity, was recognized to be a planet orbiting beyond Saturn by 1783.<sup id="cite_ref-318" class="reference"><a href="#cite_note-318"><span class="cite-bracket">[</span>299<span class="cite-bracket">]</span></a></sup> In 1838, <a href="Friedrich_Bessel" class="mw-redirect" title="Friedrich Bessel">Friedrich Bessel</a> successfully measured a <a href="Stellar_parallax" title="Stellar parallax">stellar parallax</a>, an apparent shift in the position of a star created by Earth's motion around the Sun, providing the first direct, experimental proof of heliocentrism.<sup id="cite_ref-319" class="reference"><a href="#cite_note-319"><span class="cite-bracket">[</span>300<span class="cite-bracket">]</span></a></sup> <a href="Neptune" title="Neptune">Neptune</a> was identified as a planet some years later, in 1846, thanks to its gravitational pull causing a slight but detectable variation in the orbit of Uranus.<sup id="cite_ref-320" class="reference"><a href="#cite_note-320"><span class="cite-bracket">[</span>301<span class="cite-bracket">]</span></a></sup> <a href="Perihelion_precession_of_Mercury" class="mw-redirect" title="Perihelion precession of Mercury">Mercury's orbital anomaly</a> observations led to searches for <a href="Vulcan_(hypothetical_planet)" title="Vulcan (hypothetical planet)">Vulcan</a>, a planet interior of Mercury, but these attempts were quashed with <a href="Albert_Einstein" title="Albert Einstein">Albert Einstein</a>'s theory of <a href="General_relativity" title="General relativity">general relativity</a> in 1915.<sup id="cite_ref-Clemence_321-0" class="reference"><a href="#cite_note-Clemence-321"><span class="cite-bracket">[</span>302<span class="cite-bracket">]</span></a></sup>
</p><p>In the 20th century, humans began their space exploration around the Solar System, starting with placing <a href="Space_telescope" title="Space telescope">telescopes in space</a> since the 1960s.<sup id="cite_ref-322" class="reference"><a href="#cite_note-322"><span class="cite-bracket">[</span>303<span class="cite-bracket">]</span></a></sup> By 1989, all eight planets have been visited by space probes.<sup id="cite_ref-FactSheet_323-0" class="reference"><a href="#cite_note-FactSheet-323"><span class="cite-bracket">[</span>304<span class="cite-bracket">]</span></a></sup> Probes have returned samples from comets<sup id="cite_ref-324" class="reference"><a href="#cite_note-324"><span class="cite-bracket">[</span>305<span class="cite-bracket">]</span></a></sup> and asteroids,<sup id="cite_ref-325" class="reference"><a href="#cite_note-325"><span class="cite-bracket">[</span>306<span class="cite-bracket">]</span></a></sup> as well as flown through the <a href="Sun's_corona" class="mw-redirect" title="Sun's corona">Sun's corona</a><sup id="cite_ref-326" class="reference"><a href="#cite_note-326"><span class="cite-bracket">[</span>307<span class="cite-bracket">]</span></a></sup> and visited two dwarf planets (<a href="Pluto" title="Pluto">Pluto</a> and <a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a>).<sup id="cite_ref-327" class="reference"><a href="#cite_note-327"><span class="cite-bracket">[</span>308<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NASA-20180907_328-0" class="reference"><a href="#cite_note-NASA-20180907-328"><span class="cite-bracket">[</span>309<span class="cite-bracket">]</span></a></sup> To save on fuel, some space missions make use of <a href="Gravity_assist" title="Gravity assist">gravity assist maneuvers</a>, such as the two <a href="Voyager_program" title="Voyager program"><i>Voyager</i> probes</a> accelerating when flying by planets in the outer Solar System<sup id="cite_ref-:7_329-0" class="reference"><a href="#cite_note-:7-329"><span class="cite-bracket">[</span>310<span class="cite-bracket">]</span></a></sup> and the <a href="Parker_Solar_Probe" title="Parker Solar Probe">Parker Solar Probe</a> decelerating closer towards the Sun after its flyby of Venus.<sup id="cite_ref-330" class="reference"><a href="#cite_note-330"><span class="cite-bracket">[</span>311<span class="cite-bracket">]</span></a></sup>
</p><p>Humans have landed on the Moon during the <a href="Apollo_program" title="Apollo program">Apollo program</a> in the 1960s and 1970s<sup id="cite_ref-331" class="reference"><a href="#cite_note-331"><span class="cite-bracket">[</span>312<span class="cite-bracket">]</span></a></sup> and will return to the Moon in the 2020s with the <a href="Artemis_program" title="Artemis program">Artemis program</a>.<sup id="cite_ref-sn-20230313_332-0" class="reference"><a href="#cite_note-sn-20230313-332"><span class="cite-bracket">[</span>313<span class="cite-bracket">]</span></a></sup> Discoveries in the 20th and 21st century has prompted the <a href="Definition_of_planet" title="Definition of planet">redefinition of the term <i>planet</i></a> in 2006, hence the demotion of Pluto to a dwarf planet,<sup id="cite_ref-NYT-20220118_333-0" class="reference"><a href="#cite_note-NYT-20220118-333"><span class="cite-bracket">[</span>314<span class="cite-bracket">]</span></a></sup> and further interest in <a href="Trans-Neptunian_object" title="Trans-Neptunian object">trans-Neptunian objects</a>.<sup id="cite_ref-:02_334-0" class="reference"><a href="#cite_note-:02-334"><span class="cite-bracket">[</span>315<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Interplanetary_spaceflight" title="Interplanetary spaceflight">Interplanetary spaceflight</a></li>
<li><a href="Lists_of_geological_features_of_the_Solar_System" title="Lists of geological features of the Solar System">Lists of geological features of the Solar System</a></li>
<li><a href="List_of_gravitationally_rounded_objects_of_the_Solar_System" title="List of gravitationally rounded objects of the Solar System">List of gravitationally rounded objects of the Solar System</a></li>
<li><a href="List_of_Solar_System_extremes" title="List of Solar System extremes">List of Solar System extremes</a></li>
<li><a href="List_of_Solar_System_objects_by_size" title="List of Solar System objects by size">List of Solar System objects by size</a></li>
<li><a href="Outline_of_the_Solar_System" title="Outline of the Solar System">Outline of the Solar System</a></li>
<li><a href="Solar_System_in_fiction" title="Solar System in fiction">Solar System in fiction</a></li>
<li><a href="Planetary_mnemonic" title="Planetary mnemonic">Planetary mnemonic</a> – Phrase used to remember the planets of the Solar System</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2></div>
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<div class="mw-references-wrap"><ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">The <a href="Asteroid_Belt" class="mw-redirect" title="Asteroid Belt">Asteroid Belt</a>, <a href="Kuiper_Belt" class="mw-redirect" title="Kuiper Belt">Kuiper Belt</a>, and <a href="Scattered_Disc" class="mw-redirect" title="Scattered Disc">Scattered Disc</a> are not added because the individual asteroids are too small to be shown on the diagram.</span>
</li>
<li id="cite_note-AgeSolarSystem-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-AgeSolarSystem_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-AgeSolarSystem_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">The date is based on the oldest <a href="Inclusion_(mineral)" title="Inclusion (mineral)">inclusions</a> found to date in <a href="Meteorite" title="Meteorite">meteorites</a>, <span class="nowrap">4<span style="margin-left:.25em;">568</span>.2<span style="margin-left:0.3em;"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1.2em;font-size:85%;text-align:right;">+0.2<br>−0.4</span></span></span> million years, and is thought to be the date of the formation of the first solid material in the collapsing nebula.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup></span>
</li>
<li id="cite_note-angle-16"><span class="mw-cite-backlink">^ <a href="#cite_ref-angle_16-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-angle_16-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">If <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \psi }">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mi>ψ<!-- ψ --></mi>
</mstyle>
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<annotation encoding="application/x-tex">{\displaystyle \psi }</annotation>
</semantics>
</math></span><img src="./45e5789e5d9c8f7c79744f43ecaaf8ba42a8553a.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.513ex; height:2.509ex;" alt="{\displaystyle \psi }" loading="lazy"></span> is the angle between the <a href="Ecliptic_pole" class="mw-redirect" title="Ecliptic pole">north pole of the ecliptic</a> and the north <a href="Galactic_pole" class="mw-redirect" title="Galactic pole">galactic pole</a> then:
<br><span style="font-size:120%"><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \cos \psi =\cos(\beta _{g})\cos(\beta _{e})\cos(\alpha _{g}-\alpha _{e})+\sin(\beta _{g})\sin(\beta _{e})}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mi>cos</mi>
<mo><!-- --></mo>
<mi>ψ<!-- ψ --></mi>
<mo>=</mo>
<mi>cos</mi>
<mo><!-- --></mo>
<mo stretchy="false">(</mo>
<msub>
<mi>β<!-- β --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>g</mi>
</mrow>
</msub>
<mo stretchy="false">)</mo>
<mi>cos</mi>
<mo><!-- --></mo>
<mo stretchy="false">(</mo>
<msub>
<mi>β<!-- β --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>e</mi>
</mrow>
</msub>
<mo stretchy="false">)</mo>
<mi>cos</mi>
<mo><!-- --></mo>
<mo stretchy="false">(</mo>
<msub>
<mi>α<!-- α --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>g</mi>
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<mo>−<!-- − --></mo>
<msub>
<mi>α<!-- α --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>e</mi>
</mrow>
</msub>
<mo stretchy="false">)</mo>
<mo>+</mo>
<mi>sin</mi>
<mo><!-- --></mo>
<mo stretchy="false">(</mo>
<msub>
<mi>β<!-- β --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>g</mi>
</mrow>
</msub>
<mo stretchy="false">)</mo>
<mi>sin</mi>
<mo><!-- --></mo>
<mo stretchy="false">(</mo>
<msub>
<mi>β<!-- β --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>e</mi>
</mrow>
</msub>
<mo stretchy="false">)</mo>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle \cos \psi =\cos(\beta _{g})\cos(\beta _{e})\cos(\alpha _{g}-\alpha _{e})+\sin(\beta _{g})\sin(\beta _{e})}</annotation>
</semantics>
</math></span><img src="./0355a973ffa402dc57f8f4371f702db85b17e989.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:53.341ex; height:3.009ex;" alt="{\displaystyle \cos \psi =\cos(\beta _{g})\cos(\beta _{e})\cos(\alpha _{g}-\alpha _{e})+\sin(\beta _{g})\sin(\beta _{e})}" loading="lazy"></span></span><br>
where <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \beta _{g}}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<msub>
<mi>β<!-- β --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>g</mi>
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<annotation encoding="application/x-tex">{\displaystyle \beta _{g}}</annotation>
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</math></span><img src="./876ecaef49f096f44b57f0258336275f8ba3a373.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.337ex; height:2.843ex;" alt="{\displaystyle \beta _{g}}" loading="lazy"></span> = 27° 07′ 42.01″ and <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \alpha _{g}}">
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<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<msub>
<mi>α<!-- α --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>g</mi>
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<annotation encoding="application/x-tex">{\displaystyle \alpha _{g}}</annotation>
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</math></span><img src="./db73983682cbebba39553ac1760903b39e050466.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.509ex; height:2.343ex;" alt="{\displaystyle \alpha _{g}}" loading="lazy"></span> = 12h 51m 26.282s are the declination and right ascension of the north galactic pole,<sup id="cite_ref-301" class="reference"><a href="#cite_note-301"><span class="cite-bracket">[</span>282<span class="cite-bracket">]</span></a></sup> whereas <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \beta _{e}}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<msub>
<mi>β<!-- β --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>e</mi>
</mrow>
</msub>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle \beta _{e}}</annotation>
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</math></span><img src="./ea2097c0262c82b8e921dfcc2cc9873e238bc31c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.314ex; height:2.509ex;" alt="{\displaystyle \beta _{e}}" loading="lazy"></span> = 66° 33′ 38.6″ and <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \alpha _{e}}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<msub>
<mi>α<!-- α --></mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>e</mi>
</mrow>
</msub>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle \alpha _{e}}</annotation>
</semantics>
</math></span><img src="./5a386d5764fd35c853376fd570d4c46300b19867.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.486ex; height:2.009ex;" alt="{\displaystyle \alpha _{e}}" loading="lazy"></span> = 18h 0m 00s are those for the north pole of the ecliptic. (Both pairs of coordinates are for <a href="J2000" class="mw-redirect" title="J2000">J2000</a> epoch.) The result of the calculation is 60.19°.</span>
</li>
<li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><a href="Capitalization" title="Capitalization">Capitalization</a> of the name varies. The <a href="International_Astronomical_Union" title="International Astronomical Union">International Astronomical Union</a>, the authoritative body regarding <a href="Astronomical_nomenclature" class="mw-redirect" title="Astronomical nomenclature">astronomical nomenclature</a>, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar System" and "solar system" structures in their <a rel="nofollow" class="external text" href="http://www.iau.org/public/themes/naming/">naming guidelines document</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210725053113/https://www.iau.org/public/themes/naming">Archived</a> 25 July 2021 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. The name is commonly rendered in lower case ('solar system'), as, for example, in the <i><a href="Oxford_English_Dictionary" title="Oxford English Dictionary">Oxford English Dictionary</a></i> and <a rel="nofollow" class="external text" href="http://www.m-w.com/dictionary/solar%20system"><i>Merriam-Webster's 11th Collegiate Dictionary</i></a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20080127201148/http://www.m-w.com/dictionary/solar%20system">Archived</a> 27 January 2008 at the <a href="Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</span>
</li>
<li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text">The scale of the Solar System is sufficiently large that astronomers use a custom unit to express distances. The <a href="Astronomical_unit" title="Astronomical unit">astronomical unit</a>, abbreviated AU, is equal to 150,000,000 km; 93,000,000 mi. This is what the distance from the Earth to the Sun would be if the planet's orbit were perfectly circular.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></span>
</li>
<li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text">The <a href="International_Astronomical_Union" title="International Astronomical Union">International Astronomical Union</a>'s Minor Planet Center has yet to officially list Orcus, Quaoar, Gonggong, and Sedna as dwarf planets as of 2024.</span>
</li>
<li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text">For more classifications of Solar System objects, see <a href="List_of_minor-planet_groups" title="List of minor-planet groups">List of minor-planet groups</a> and <a href="Comet#Classification" title="Comet">Comet § Classification</a>.</span>
</li>
<li id="cite_note-footnoteD-57"><span class="mw-cite-backlink">^ <a href="#cite_ref-footnoteD_57-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-footnoteD_57-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">The mass of the Solar System excluding the Sun, Jupiter and Saturn can be determined by adding together all the calculated masses for its largest objects and using rough calculations for the masses of the Oort cloud (estimated at roughly 3 Earth masses),<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> the Kuiper belt (estimated at 0.1 Earth mass)<sup id="cite_ref-Delsanti-Beyond_The_Planets_55-0" class="reference"><a href="#cite_note-Delsanti-Beyond_The_Planets-55"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> and the asteroid belt (estimated to be 0.0005 Earth mass)<sup id="cite_ref-Krasinsky2002_56-0" class="reference"><a href="#cite_note-Krasinsky2002-56"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> for a total, rounded upwards, of ~37 Earth masses, or 8.1% of the mass in orbit around the Sun. With the combined masses of Uranus and Neptune (~31 Earth masses) subtracted, the remaining ~6 Earth masses of material comprise 1.3% of the total orbiting mass.</span>
</li>
</ol></div></div>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
<div class="mw-heading mw-heading3"><h3 id="Data_sources">Data sources</h3></div>
<div class="reflist">
<div class="mw-references-wrap mw-references-columns"><ol class="references">
<li id="cite_note-lurie2014-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-lurie2014_5-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite id="CITEREFLurieHenryJaoQuinn2014" class="citation journal cs1">Lurie, John C.; Henry, Todd J.; Jao, Wei-Chun; et al. (2014). "The Solar neighborhood. XXXIV. A search for planets orbiting nearby M dwarfs using astrometry". <i>The Astronomical Journal</i>. <b>148</b> (5): 91. <a href="ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/1407.4820">1407.4820</a></span>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2014AJ....148...91L">2014AJ....148...91L</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1088%2F0004-6256%2F148%2F5%2F91">10.1088/0004-6256/148/5/91</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0004-6256">0004-6256</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:118492541">118492541</a>.</cite></span>
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<li id="cite_note-JPLbodies-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-JPLbodies_7-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov">"Solar System Objects"</a>. NASA/JPL Solar System Dynamics. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210707142304/https://ssd.jpl.nasa.gov">Archived</a> from the original on 7 July 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">14 August</span> 2023</span>.</cite></span>
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<li id="cite_note-MPCSummary-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-MPCSummary_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-MPCSummary_8-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://minorplanetcenter.net/mpc/summary">"Latest Published Data"</a>. <i>The International Astronomical Union Minor Planet Center</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20190305034947/https://minorplanetcenter.net/mpc/summary">Archived</a> from the original on 5 March 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">27 May</span> 2024</span>.</cite></span>
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<li id="cite_note-Horizons-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-Horizons_9-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFYeomans" class="citation web cs1">Yeomans, Donald K. <a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%278%27&TABLE_TYPE=%27ELEMENTS%27&START_TIME=%272000-01-01%27&STOP_TIME=%272000-01-02%27&STEP_SIZE=%27200%20years%27&CENTER=%27@0%27&OUT_UNITS=%27AU-D%27">"HORIZONS Web-Interface for Neptune Barycenter (Major Body=8)"</a>. <i>jpl.nasa.gov</i>. <a href="JPL_Horizons_On-Line_Ephemeris_System" title="JPL Horizons On-Line Ephemeris System">JPL Horizons On-Line Ephemeris System</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210907055935/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%278%27&TABLE_TYPE=%27ELEMENTS%27&START_TIME=%272000-01-01%27&STOP_TIME=%272000-01-02%27&STEP_SIZE=%27200%20years%27&CENTER=%27%400%27&OUT_UNITS=%27AU-D%27">Archived</a> from the original on 7 September 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">18 July</span> 2014</span>.</cite> – Select "Ephemeris Type: Orbital Elements", "Time Span: 2000-01-01 12:00 to 2000-01-02". ("Target Body: Neptune Barycenter" and "Center: Solar System Barycenter (@0)".)</span>
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<li id="cite_note-nasa-factsheet-110"><span class="mw-cite-backlink">^ <a href="#cite_ref-nasa-factsheet_110-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-5"><sup><i><b>f</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-6"><sup><i><b>g</b></i></sup></a> <a href="#cite_ref-nasa-factsheet_110-7"><sup><i><b>h</b></i></sup></a></span> <span class="reference-text"><cite id="CITEREFWilliams2021" class="citation web cs1">Williams, David (27 December 2021). <a rel="nofollow" class="external text" href="https://nssdc.gsfc.nasa.gov/planetary/factsheet">"Planetary Fact Sheet – Metric"</a>. <a href="Goddard_Space_Flight_Center" title="Goddard Space Flight Center">Goddard Space Flight Center</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110818181734/http://nssdc.gsfc.nasa.gov/planetary/factsheet/">Archived</a> from the original on 18 August 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">11 December</span> 2022</span>.</cite></span>
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<li id="cite_note-jplssd-144"><span class="mw-cite-backlink"><b><a href="#cite_ref-jplssd_144-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/?sat_phys_par">"Planetary Satellite Physical Parameters"</a>. <a href="JPL" class="mw-redirect" title="JPL">JPL</a> (Solar System Dynamics). 13 July 2006. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20131101144111/http://ssd.jpl.nasa.gov/?sat_phys_par">Archived</a> from the original on 1 November 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">29 January</span> 2008</span>.</cite></span>
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<li id="cite_note-Horizons-Deimos-147"><span class="mw-cite-backlink"><b><a href="#cite_ref-Horizons-Deimos_147-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/?horizons">"HORIZONS Web-Interface"</a>. NASA. 21 September 2013. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070328180634/http://ssd.jpl.nasa.gov/?horizons">Archived</a> from the original on 28 March 2007<span class="reference-accessdate">. Retrieved <span class="nowrap">4 December</span> 2013</span>.</cite></span>
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<li id="cite_note-JPLSSD-148"><span class="mw-cite-backlink"><b><a href="#cite_ref-JPLSSD_148-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/?sat_phys_par">"Planetary Satellite Physical Parameters"</a>. <a href="Jet_Propulsion_Laboratory" title="Jet Propulsion Laboratory">Jet Propulsion Laboratory</a> (Solar System Dynamics). 13 July 2006. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20131101144111/http://ssd.jpl.nasa.gov/?sat_phys_par">Archived</a> from the original on 1 November 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">29 January</span> 2008</span>.</cite></span>
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<li id="cite_note-jpldata-245"><span class="mw-cite-backlink"><b><a href="#cite_ref-jpldata_245-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2225088">"JPL Small-Body Database Browser: 225088 Gonggong (2007 OR10)"</a> (20 September 2015 last obs.). <a href="Jet_Propulsion_Laboratory" title="Jet Propulsion Laboratory">Jet Propulsion Laboratory</a>. 10 April 2017. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200610013703/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2225088">Archived</a> from the original on 10 June 2020<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2020</span>.</cite></span>
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<li id="cite_note-jpldata2-249"><span class="mw-cite-backlink"><b><a href="#cite_ref-jpldata2_249-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3830896">"JPL Small-Body Database Browser: (2015 TG387)"</a> (2018-10-17 last obs.). <a href="Jet_Propulsion_Laboratory" title="Jet Propulsion Laboratory">Jet Propulsion Laboratory</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200414180200/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3830896">Archived</a> from the original on 14 April 2020<span class="reference-accessdate">. Retrieved <span class="nowrap">13 December</span> 2018</span>.</cite></span>
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</ol></div></div>
<div class="mw-heading mw-heading3"><h3 id="Other_sources">Other sources</h3></div>
<div class="reflist">
<div class="mw-references-wrap mw-references-columns"><ol class="references">
<li id="cite_note-JPL_interstellar-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-JPL_interstellar_3-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20131121061128/http://interstellar.jpl.nasa.gov/interstellar/probe/introduction/neighborhood.html">"Our Local Galactic Neighborhood"</a>. <i>interstellar.jpl.nasa.gov</i>. Interstellar Probe Project. NASA. 2000. Archived from <a rel="nofollow" class="external text" href="https://interstellar.jpl.nasa.gov/interstellar/probe/introduction/neighborhood.html">the original</a> on 21 November 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">8 August</span> 2012</span>.</cite></span>
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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFHurt2017" class="citation web cs1">Hurt, R. (8 November 2017). <a rel="nofollow" class="external text" href="https://science.nasa.gov/resource/the-milky-way-galaxy/">"The Milky Way Galaxy"</a>. <i>science.nasa.gov</i><span class="reference-accessdate">. Retrieved <span class="nowrap">19 April</span> 2024</span>.</cite></span>
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<li id="cite_note-twotino-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-twotino_10-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFChiangJordanMillisBuie2003" class="citation journal cs1">Chiang, E. I.; Jordan, A. B.; Millis, R. L.; et al. (2003). "Resonance Occupation in the Kuiper Belt: Case Examples of the 5:2 and Trojan Resonances". <i><a href="The_Astronomical_Journal" title="The Astronomical Journal">The Astronomical Journal</a></i>. <b>126</b> (1): <span class="nowrap">430–</span>443. <a href="ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/astro-ph/0301458">astro-ph/0301458</a></span>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2003AJ....126..430C">2003AJ....126..430C</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1086%2F375207">10.1086/375207</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:54079935">54079935</a>.</cite></span>
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<li id="cite_note-KuiperGap-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-KuiperGap_11-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFde_la_Fuente_Marcosde_la_Fuente_Marcos2024" class="citation journal cs1">de la Fuente Marcos, C.; de la Fuente Marcos, R. (January 2024). <a rel="nofollow" class="external text" href="https://academic.oup.com/mnrasl/article-abstract/527/1/L110/7280408">"Past the outer rim, into the unknown: structures beyond the Kuiper Cliff"</a>. <i><a href="Monthly_Notices_of_the_Royal_Astronomical_Society_Letters" class="mw-redirect" title="Monthly Notices of the Royal Astronomical Society Letters">Monthly Notices of the Royal Astronomical Society Letters</a></i>. <b>527</b> (1) (published 20 September 2023): <span class="nowrap">L110 –</span> <span class="nowrap">L114</span>. <a href="ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/2309.03885">2309.03885</a></span>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2024MNRAS.527L.110D">2024MNRAS.527L.110D</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fmnrasl%2Fslad132">10.1093/mnrasl/slad132</a></span>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20231028132004/https://academic.oup.com/mnrasl/article-abstract/527/1/L110/7280408">Archived</a> from the original on 28 October 2023<span class="reference-accessdate">. Retrieved <span class="nowrap">28 September</span> 2023</span>.</cite></span>
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<li id="cite_note-146"><span class="mw-cite-backlink"><b><a href="#cite_ref-146">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.solarviews.com/cap/mars/phobos2.htm">"Stickney Crater-Phobos"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20111103010644/http://www.solarviews.com/cap/mars/phobos2.htm">Archived</a> from the original on 3 November 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">21 April</span> 2024</span>. <q>One of the most striking features of Phobos, aside from its irregular shape, is its giant crater Stickney. Because Phobos is only 28 by 20 kilometers (17 by 12 mi), it must have been nearly shattered from the force of the impact that caused the giant crater. Grooves that extend across the surface from Stickney appear to be surface fractures caused by the impact.</q></cite></span>
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<li id="cite_note-149"><span class="mw-cite-backlink"><b><a href="#cite_ref-149">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.britannica.com/place/Deimos-moon-of-Mars">"Deimos"</a>. <i>Britannica</i>. 6 June 2023. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20181112023547/https://www.britannica.com/place/Deimos-moon-of-Mars">Archived</a> from the original on 12 November 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">21 April</span> 2024</span>. <q>It thus appears smoother than Phobos because its craters lie partially buried under this loose material.</q></cite></span>
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<li id="cite_note-308"><span class="mw-cite-backlink"><b><a href="#cite_ref-308">^</a></b></span> <span class="reference-text"><cite id="CITEREFWeinert2009" class="citation book cs1">Weinert, Friedel (2009). <span class="id-lock-limited" title="Free access subject to limited trial, subscription normally required"><a rel="nofollow" class="external text" href="https://archive.org/details/copernicusdarwin00wein"><i>Copernicus, Darwin, & Freud: revolutions in the history and philosophy of science</i></a></span>. <a href="Wiley-Blackwell" title="Wiley-Blackwell">Wiley-Blackwell</a>. p. <a rel="nofollow" class="external text" href="https://archive.org/details/copernicusdarwin00wein/page/n29">21</a>. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-1-4051-8183-9</bdi>.</cite></span>
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<li id="cite_note-309"><span class="mw-cite-backlink"><b><a href="#cite_ref-309">^</a></b></span> <span class="reference-text"><cite id="CITEREFLoLordo2007" class="citation book cs1">LoLordo, Antonia (2007). <i>Pierre Gassendi and the Birth of Early Modern Philosophy</i>. New York: Cambridge University Press. pp. 12, 27. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-511-34982-9</bdi>. <a href="OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/182818133">182818133</a>.</cite></span>
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<li id="cite_note-310"><span class="mw-cite-backlink"><b><a href="#cite_ref-310">^</a></b></span> <span class="reference-text"><cite id="CITEREFAthreyaGingerich1996" class="citation journal cs1">Athreya, A.; Gingerich, O. (December 1996). "An Analysis of Kepler's Rudolphine Tables and Implications for the Reception of His Physical Astronomy". <i>Bulletin of the American Astronomical Society</i>. <b>28</b> (4): 1305. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1996AAS...189.2404A">1996AAS...189.2404A</a>.</cite></span>
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<li id="cite_note-311"><span class="mw-cite-backlink"><b><a href="#cite_ref-311">^</a></b></span> <span class="reference-text"><cite id="CITEREFPasachoff2015" class="citation journal cs1">Pasachoff, Jay M. (May 2015). <a rel="nofollow" class="external text" href="http://journals.sagepub.com/doi/10.1177/0021828615585493">"Simon Marius's Mundus Iovialis: 400th Anniversary in Galileo's Shadow"</a>. <i>Journal for the History of Astronomy</i>. <b>46</b> (2): <span class="nowrap">218–</span>234. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2015JHA....46..218P">2015JHA....46..218P</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1177%2F0021828615585493">10.1177/0021828615585493</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0021-8286">0021-8286</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:120470649">120470649</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20211127213209/https://journals.sagepub.com/doi/10.1177/0021828615585493">Archived</a> from the original on 27 November 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">1 April</span> 2022</span>.</cite></span>
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<li id="cite_note-312"><span class="mw-cite-backlink"><b><a href="#cite_ref-312">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.esa.int/About_Us/ESA_history/Christiaan_Huygens_Discoverer_of_Titan">"Christiaan Huygens: Discoverer of Titan"</a>. <i>ESA Space Science</i>. The European Space Agency. 8 December 2012. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20191206001920/http://www.esa.int/About_Us/ESA_history/Christiaan_Huygens_Discoverer_of_Titan">Archived</a> from the original on 6 December 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">27 October</span> 2010</span>.</cite></span>
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<li id="cite_note-313"><span class="mw-cite-backlink"><b><a href="#cite_ref-313">^</a></b></span> <span class="reference-text"><cite id="CITEREFChapman2005" class="citation conference cs1">Chapman, Allan (April 2005). Kurtz, D. W. (ed.). <i>Jeremiah Horrocks, William Crabtree, and the Lancashire observations of the transit of Venus of 1639</i>. Transits of Venus: New Views of the Solar System and Galaxy, Proceedings of IAU Colloquium #196, held 7–11 June 2004 in Preston, U.K. <i>Proceedings of the International Astronomical Union</i>. Vol. 2004. Cambridge: Cambridge University Press. pp. <span class="nowrap">3–</span>26. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2005tvnv.conf....3C">2005tvnv.conf....3C</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1017%2FS1743921305001225">10.1017/S1743921305001225</a></span>.</cite></span>
</li>
<li id="cite_note-314"><span class="mw-cite-backlink"><b><a href="#cite_ref-314">^</a></b></span> <span class="reference-text">See, for example:
<ul><li><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.etymonline.com/word/solar">"solar"</a>. <i><a href="Online_Etymology_Dictionary" class="mw-redirect" title="Online Etymology Dictionary">Online Etymology Dictionary</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220318002833/https://www.etymonline.com/word/solar">Archived</a> from the original on 18 March 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">17 March</span> 2022</span>.</cite></li>
<li><cite id="CITEREFReference-OED-solar_system" class="citation encyclopaedia cs1"><span class="id-lock-subscription" title="Paid subscription required"><a rel="nofollow" class="external text" href="https://www.oed.com/search/dictionary/?q=solar+system">"solar system"</a></span>. <i><a href="Oxford_English_Dictionary" title="Oxford English Dictionary">Oxford English Dictionary</a></i> (Online ed.). <a href="Oxford_University_Press" title="Oxford University Press">Oxford University Press</a>.</cite> <span style="font-size:0.95em; font-size:95%; color: var( --color-subtle, #555 )">(Subscription or <a rel="nofollow" class="external text" href="https://www.oed.com/public/login/loggingin#withyourlibrary">participating institution membership</a> required.)</span></li>
<li><cite id="CITEREFLocke1754" class="citation book cs1"><a href="John_Locke" title="John Locke">Locke, John</a> (1754) [1720]. <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Ni9bAAAAcAAJ"><i>Elements of Natural Philosophy ... To which are added. Some Thoughts concerning Reading and Study for a Gentleman. By the same author. With prefatory remarks by P. Des Maizeaux</i></a>. R. Taylor. p. 8. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220318005707/https://books.google.com/books?id=Ni9bAAAAcAAJ&newbks=0">Archived</a> from the original on 18 March 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">18 March</span> 2022</span>.</cite> Posthumous publication.</li></ul>
</span></li>
<li id="cite_note-315"><span class="mw-cite-backlink"><b><a href="#cite_ref-315">^</a></b></span> <span class="reference-text"><cite id="CITEREFFestouKellerWeaver2004" class="citation book cs1">Festou, M. C.; Keller, H. U.; Weaver, H. A. (2004). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=ehA8EAAAQBAJ&pg=PA4">"A brief conceptual history of cometary science"</a>. <i>Comets II</i>. Tucson: University of Arizona Press. pp. <span class="nowrap">3–</span>16. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2004come.book....3F">2004come.book....3F</a>. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0816524501</bdi>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220420161222/https://www.google.com/books/edition/Comets_II/ehA8EAAAQBAJ?gbpv=1&pg=PA4">Archived</a> from the original on 20 April 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">7 April</span> 2022</span>.</cite></span>
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<li id="cite_note-316"><span class="mw-cite-backlink"><b><a href="#cite_ref-316">^</a></b></span> <span class="reference-text"><cite id="CITEREFSaganDruyan1997" class="citation book cs1"><a href="Carl_Sagan" title="Carl Sagan">Sagan, Carl</a>; <a href="Ann_Druyan" title="Ann Druyan">Druyan, Ann</a> (1997). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=LhkoowKFaTsC"><i>Comet</i></a>. New York: Random House. pp. <span class="nowrap">26–</span>27, <span class="nowrap">37–</span>38. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-3078-0105-0</bdi>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210615020250/https://books.google.com/books?id=LhkoowKFaTsC">Archived</a> from the original on 15 June 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">28 June</span> 2021</span>.</cite></span>
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<li id="cite_note-317"><span class="mw-cite-backlink"><b><a href="#cite_ref-317">^</a></b></span> <span class="reference-text"><cite id="CITEREFTeets2003" class="citation journal cs1">Teets, Donald (December 2003). <a rel="nofollow" class="external text" href="http://www.maa.org/sites/default/files/pdf/pubs/mm_dec03-Venus.pdf">"Transits of Venus and the Astronomical Unit"</a> <span class="cs1-format">(PDF)</span>. <i>Mathematics Magazine</i>. <b>76</b> (5): <span class="nowrap">335–</span>348. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1080%2F0025570X.2003.11953207">10.1080/0025570X.2003.11953207</a>. <a href="JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/3654879">3654879</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:54867823">54867823</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220203080207/https://www.maa.org/sites/default/files/pdf/pubs/mm_dec03-Venus.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 3 February 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">3 April</span> 2022</span>.</cite></span>
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<li id="cite_note-318"><span class="mw-cite-backlink"><b><a href="#cite_ref-318">^</a></b></span> <span class="reference-text"><cite id="CITEREFBourtembourg2013" class="citation journal cs1">Bourtembourg, René (2013). "Was Uranus Observed by Hipparchos?". <i>Journal for the History of Astronomy</i>. <b>44</b> (4): <span class="nowrap">377–</span>387. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2013JHA....44..377B">2013JHA....44..377B</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1177%2F002182861304400401">10.1177/002182861304400401</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:122482074">122482074</a>.</cite></span>
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</ol></div></div>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
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<ul><li><cite class="citation encyclopaedia cs1"><span class="cs1-ws-icon" title="s:1911 Encyclopædia Britannica/Solar System"><a class="external text external" href="https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Solar_System">"Solar System" </a></span>. <i><a href="Encyclop%C3%A6dia_Britannica_Eleventh_Edition" title="Encyclopædia Britannica Eleventh Edition">Encyclopædia Britannica</a></i>. Vol. 25 (11th ed.). 1911. pp. <span class="nowrap">157–</span>158.</cite></li>
<li><a rel="nofollow" class="external text" href="http://www.joshworth.com/a-tediously-accurate-map-of-the-solar-system/">If the Moon were only 1 Pixel: A Tediously Accurate Map of the Solar System (web based scroll map scaled to the Moon being 1 pixel)</a></li>
<li><a rel="nofollow" class="external text" href="https://eyes.nasa.gov/apps/solar-system">NASA's Eyes on the Solar System</a></li>
<li><a rel="nofollow" class="external text" href="https://solarsystem.nasa.gov/">NASA's Solar System Exploration</a></li>
<li><a rel="nofollow" class="external text" href="https://space.jpl.nasa.gov">NASA's Solar System Simulator</a></li></ul>
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<ul><li><a href="Sun" title="Sun">Sun</a></li>
<li><a href="Mercury_(planet)" title="Mercury (planet)">Mercury</a></li>
<li><a href="Venus" title="Venus">Venus</a></li>
<li><a href="Earth" title="Earth">Earth</a></li>
<li><a href="Mars" title="Mars">Mars</a></li>
<li><i><a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></i></li>
<li><a href="Jupiter" title="Jupiter">Jupiter</a></li>
<li><a href="Saturn" title="Saturn">Saturn</a></li>
<li><a href="Uranus" title="Uranus">Uranus</a></li>
<li><a href="Neptune" title="Neptune">Neptune</a></li>
<li><i><a href="Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a></i></li>
<li><i><a href="Pluto" title="Pluto">Pluto</a></i></li>
<li><i><a href="Haumea" title="Haumea">Haumea</a></i></li>
<li><i><a href="Quaoar" title="Quaoar">Quaoar</a></i></li>
<li><i><a href="Makemake" title="Makemake">Makemake</a></i></li>
<li><i><a href="Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a></i></li>
<li><i><a href="Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a></i></li>
<li><i><a href="Sedna_(dwarf_planet)" title="Sedna (dwarf planet)">Sedna</a></i></li></ul></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0;background:transparent;color:inherit;"><div style="padding:0px"><table class="navbox-columns-table" style="border-spacing: 0px; text-align:left;width:100%;"><tbody><tr style="vertical-align:top"><td class="navbox-list" style="padding:0px;width:50%;"><div>
</div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Planets,_dwarfs,_minors255" scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="Planet" title="Planet">Planets</a>,<br> <a href="Dwarf_planet" title="Dwarf planet">dwarfs</a>, <br> <a href="Minor_planet" title="Minor planet">minors</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Terrestrial_planet" title="Terrestrial planet">Terrestrials</a>
<ul><li><a href="Mercury_(planet)" title="Mercury (planet)">Mercury</a></li>
<li><a href="Venus" title="Venus">Venus</a></li>
<li><a href="Earth" title="Earth">Earth</a></li>
<li><a href="Mars" title="Mars">Mars</a></li></ul></li>
<li><a href="Giant_planet" title="Giant planet">Giants</a>
<ul><li><a href="Gas_giant" title="Gas giant">Gas</a>
<ul><li><a href="Jupiter" title="Jupiter">Jupiter</a></li>
<li><a href="Saturn" title="Saturn">Saturn</a></li></ul></li>
<li><a href="Ice_giant" title="Ice giant">Ice</a>
<ul><li><a href="Uranus" title="Uranus">Uranus</a></li>
<li><a href="Neptune" title="Neptune">Neptune</a></li></ul></li></ul></li>
<li><a href="Dwarf_planet" title="Dwarf planet">Dwarfs</a>
<ul><li><a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></li>
<li><a href="Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a></li>
<li><a href="Pluto" title="Pluto">Pluto</a></li>
<li><a href="Haumea" title="Haumea">Haumea</a></li>
<li><a href="Quaoar" title="Quaoar">Quaoar</a></li>
<li><a href="Makemake" title="Makemake">Makemake</a></li>
<li><a href="Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a></li>
<li><a href="Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a></li>
<li><a href="Sedna_(dwarf_planet)" title="Sedna (dwarf planet)">Sedna</a></li></ul></li>
<li><a href="Minor_planet" title="Minor planet">Large Minor Planets</a>
<ul><li><a href="120347_Salacia" title="120347 Salacia">Salacia</a></li>
<li><a href="20000_Varuna" title="20000 Varuna">Varuna</a></li>
<li><a href="28978_Ixion" title="28978 Ixion">Ixion</a></li>
<li><a href="List_of_minor_planets" title="List of minor planets">List</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="Natural_satellite" title="Natural satellite">Moons</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li>Earth
<ul><li><a href="Moon" title="Moon">Moon</a>
<ul><li><a href="Claimed_moons_of_Earth" title="Claimed moons of Earth">Claimed</a></li></ul></li></ul></li>
<li><a href="Moons_of_Mars" title="Moons of Mars">Mars</a>
<ul><li><a href="Phobos_(moon)" title="Phobos (moon)">Phobos</a></li>
<li><a href="Deimos_(moon)" title="Deimos (moon)">Deimos</a></li></ul></li>
<li><a href="Moons_of_Jupiter" title="Moons of Jupiter">Jupiter</a>
<ul><li><a href="Ganymede_(moon)" title="Ganymede (moon)">Ganymede</a></li>
<li><a href="Callisto_(moon)" title="Callisto (moon)">Callisto</a></li>
<li><a href="Io_(moon)" title="Io (moon)">Io</a></li>
<li><a href="Europa_(moon)" title="Europa (moon)">Europa</a></li>
<li><a href="Moons_of_Jupiter#List" title="Moons of Jupiter">all 97</a></li></ul></li>
<li><a href="Moons_of_Saturn" title="Moons of Saturn">Saturn</a>
<ul><li><a href="Titan_(moon)" title="Titan (moon)">Titan</a></li>
<li><a href="Rhea_(moon)" title="Rhea (moon)">Rhea</a></li>
<li><a href="Iapetus_(moon)" title="Iapetus (moon)">Iapetus</a></li>
<li><a href="Dione_(moon)" title="Dione (moon)">Dione</a></li>
<li><a href="Tethys_(moon)" title="Tethys (moon)">Tethys</a></li>
<li><a href="Enceladus" title="Enceladus">Enceladus</a></li>
<li><a href="Mimas" title="Mimas">Mimas</a></li>
<li><a href="Hyperion_(moon)" title="Hyperion (moon)">Hyperion</a></li>
<li><a href="Phoebe_(moon)" title="Phoebe (moon)">Phoebe</a></li>
<li><a href="Moons_of_Saturn#List" title="Moons of Saturn">all 274</a></li></ul></li>
<li><a href="Moons_of_Uranus" title="Moons of Uranus">Uranus</a>
<ul><li><a href="Titania_(moon)" title="Titania (moon)">Titania</a></li>
<li><a href="Oberon_(moon)" title="Oberon (moon)">Oberon</a></li>
<li><a href="Umbriel" title="Umbriel">Umbriel</a></li>
<li><a href="Ariel_(moon)" title="Ariel (moon)">Ariel</a></li>
<li><a href="Miranda_(moon)" title="Miranda (moon)">Miranda</a></li>
<li><a href="Moons_of_Uranus#List" title="Moons of Uranus">all 28</a></li></ul></li>
<li><a href="Moons_of_Neptune" title="Moons of Neptune">Neptune</a>
<ul><li><a href="Triton_(moon)" title="Triton (moon)">Triton</a></li>
<li><a href="Proteus_(moon)" title="Proteus (moon)">Proteus</a></li>
<li><a href="Nereid_(moon)" title="Nereid (moon)">Nereid</a></li>
<li><a href="Moons_of_Neptune#List" title="Moons of Neptune">all 16</a></li></ul></li>
<li><a href="Moons_of_Pluto" title="Moons of Pluto">Pluto</a>
<ul><li><a href="Charon_(moon)" title="Charon (moon)">Charon</a></li>
<li><a href="Nix_(moon)" title="Nix (moon)">Nix</a></li>
<li><a href="Hydra_(moon)" title="Hydra (moon)">Hydra</a></li>
<li><a href="Kerberos_(moon)" title="Kerberos (moon)">Kerberos</a></li>
<li><a href="Styx_(moon)" title="Styx (moon)">Styx</a></li></ul></li>
<li><a href="Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a>
<ul><li><a href="Vanth_(moon)" title="Vanth (moon)">Vanth</a></li></ul></li>
<li><a href="Moons_of_Haumea" title="Moons of Haumea">Haumea</a>
<ul><li><a href="Hi%CA%BBiaka_(moon)" title="Hiʻiaka (moon)">Hiʻiaka</a></li>
<li><a href="Namaka_(moon)" title="Namaka (moon)">Namaka</a></li></ul></li>
<li><a href="Quaoar" title="Quaoar">Quaoar</a>
<ul><li><a href="Weywot" title="Weywot">Weywot</a></li></ul></li>
<li><a href="Makemake" title="Makemake">Makemake</a>
<ul><li><a href="S/2015_(136472)_1" title="S/2015 (136472) 1">S/2015 (136472) 1</a></li></ul></li>
<li><a href="Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a>
<ul><li><a href="Xiangliu_(moon)" title="Xiangliu (moon)">Xiangliu</a></li></ul></li>
<li><a href="Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a>
<ul><li><a href="Dysnomia_(moon)" title="Dysnomia (moon)">Dysnomia</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="Space_exploration" title="Space exploration">Exploration</a><br>(<a href="Outline_of_space_exploration" title="Outline of space exploration">outline</a>)</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Space_colonization" title="Space colonization">Colonization</a></li>
<li><a href="Discovery_and_exploration_of_the_Solar_System" title="Discovery and exploration of the Solar System">Discovery</a>
<ul><li><a href="Astronomy" title="Astronomy">astronomy</a></li>
<li><a href="Historical_models_of_the_Solar_System" title="Historical models of the Solar System">historical models</a></li>
<li><a href="Timeline_of_discovery_of_Solar_System_planets_and_their_moons" title="Timeline of discovery of Solar System planets and their moons">timeline</a></li></ul></li>
<li><a href="Space_probe" class="mw-redirect" title="Space probe">Space probes</a>
<ul><li><a href="Timeline_of_Solar_System_exploration" title="Timeline of Solar System exploration">timeline</a></li>
<li><a href="List_of_Solar_System_probes" title="List of Solar System probes">list</a></li></ul></li>
<li><a href="Human_spaceflight" title="Human spaceflight">Human spaceflight</a>
<ul><li><a href="Space_station" title="Space station">space stations</a></li>
<li><a href="List_of_crewed_spacecraft" title="List of crewed spacecraft">list</a></li>
<li><a href="Human_spaceflight_programs" title="Human spaceflight programs">programs</a></li></ul></li>
<li><a href="Exploration_of_Mercury" title="Exploration of Mercury">Mercury</a></li>
<li><a href="Observations_and_explorations_of_Venus" title="Observations and explorations of Venus">Venus</a></li>
<li><a href="Exploration_of_the_Moon" title="Exploration of the Moon">Moon</a>
<ul><li><a href="Lunar_resources" title="Lunar resources">mining</a></li></ul></li>
<li><a href="Exploration_of_Mars" title="Exploration of Mars">Mars</a></li>
<li><a href="Ceres_(dwarf_planet)#Exploration" title="Ceres (dwarf planet)">Ceres</a></li>
<li><a href="Asteroid#Exploration" title="Asteroid">Asteroids</a>
<ul><li><a href="Asteroid_mining" title="Asteroid mining">mining</a></li></ul></li>
<li><a href="List_of_missions_to_comets" title="List of missions to comets">Comets</a></li>
<li><a href="Exploration_of_Jupiter" title="Exploration of Jupiter">Jupiter</a></li>
<li><a href="Exploration_of_Saturn" title="Exploration of Saturn">Saturn</a></li>
<li><a href="Exploration_of_Uranus" title="Exploration of Uranus">Uranus</a></li>
<li><a href="Exploration_of_Neptune" title="Exploration of Neptune">Neptune</a></li>
<li><a href="Exploration_of_Pluto" title="Exploration of Pluto">Pluto</a></li>
<li><a href="Deep_space_exploration" title="Deep space exploration">Deep space</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="List_of_hypothetical_Solar_System_objects" title="List of hypothetical Solar System objects">Hypothetical <br>objects</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Claimed_moons_of_Earth#Other_claims" title="Claimed moons of Earth">Bagby's moon</a></li>
<li><a href="Chiron_(hypothetical_moon)" title="Chiron (hypothetical moon)">Chiron</a></li>
<li><a href="Coatlicue_(star)" title="Coatlicue (star)">Coatlicue</a></li>
<li><a href="Counter-Earth" title="Counter-Earth">Counter-Earth</a></li>
<li><a href="Chrysalis_(hypothetical_moon)" title="Chrysalis (hypothetical moon)">Chrysalis</a></li>
<li><a href="Fifth_Giant" title="Fifth Giant">Fifth Giant</a></li>
<li><a href="Hyperion_(hypothetical_planet)" class="mw-redirect" title="Hyperion (hypothetical planet)">Hyperion</a></li>
<li><a href="Planetary_objects_proposed_in_religion%2C_astrology%2C_ufology_and_pseudoscience#Lilith" title="Planetary objects proposed in religion, astrology, ufology and pseudoscience">Lilith</a></li>
<li><a href="Hypothetical_moon_of_Mercury" title="Hypothetical moon of Mercury">Mercury's moon</a></li>
<li><a href="Neith_(hypothetical_moon)" title="Neith (hypothetical moon)">Neith</a></li>
<li><a href="Nemesis_(hypothetical_star)" title="Nemesis (hypothetical star)">Nemesis</a></li>
<li><a href="Nibiru_cataclysm" title="Nibiru cataclysm">Nibiru</a></li>
<li><a href="Claimed_moons_of_Earth#Petit's_moon" title="Claimed moons of Earth">Petit's moon</a></li>
<li><a href="Phaeton_(hypothetical_planet)" title="Phaeton (hypothetical planet)">Phaeton</a></li>
<li><a href="Planet_Nine" title="Planet Nine">Planet Nine</a>
<ul><li><a href="Effects_of_Planet_Nine_on_trans-Neptunian_objects" title="Effects of Planet Nine on trans-Neptunian objects">Effects</a></li></ul></li>
<li><a href="Planets_beyond_Neptune#Kuiper_cliff_and_"Planet_Ten"" title="Planets beyond Neptune">Planet Ten</a></li>
<li><a href="Planet_V" title="Planet V">Planet V</a></li>
<li><a href="Planets_beyond_Neptune#Planet_X" title="Planets beyond Neptune">Planet X</a></li>
<li><a href="Subsatellite" title="Subsatellite">Subsatellites</a></li>
<li><a href="Synestia#Giant-impact_hypothesis" title="Synestia">Synestia</a></li>
<li><a href="Theia_(hypothetical_planet)" title="Theia (hypothetical planet)">Theia</a></li>
<li><a href="Themis_(hypothetical_moon)" title="Themis (hypothetical moon)">Themis</a></li>
<li><a href="Tyche_(hypothetical_planet)" title="Tyche (hypothetical planet)">Tyche</a></li>
<li><a href="Vulcan_(hypothetical_planet)" title="Vulcan (hypothetical planet)">Vulcan</a>
<ul><li><a href="Vulcanoid" title="Vulcanoid">Vulcanoids</a></li></ul></li>
<li><a href="Claimed_moons_of_Earth#Waltemath's_moons" title="Claimed moons of Earth">Waltemath's moons</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align:center;">Lists</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Lists_of_comets" title="Lists of comets">Comets</a></li>
<li><a href="List_of_possible_dwarf_planets" title="List of possible dwarf planets">Possible dwarf planets</a></li>
<li><a href="List_of_gravitationally_rounded_objects_of_the_Solar_System" title="List of gravitationally rounded objects of the Solar System">Gravitationally rounded objects</a></li>
<li><a href="List_of_minor_planets" title="List of minor planets">Minor planets</a></li>
<li><a href="List_of_natural_satellites" title="List of natural satellites">Natural satellites</a></li>
<li><a href="Solar_System_model" title="Solar System model">Solar System models</a></li>
<li><a href="List_of_Solar_System_objects" title="List of Solar System objects">Solar System objects</a>
<ul><li><a href="List_of_Solar_System_objects_by_size" title="List of Solar System objects by size">by size</a></li>
<li><a href="Timeline_of_discovery_of_Solar_System_planets_and_their_moons" title="Timeline of discovery of Solar System planets and their moons">by discovery date</a></li></ul></li>
<li><a href="List_of_interstellar_and_circumstellar_molecules" title="List of interstellar and circumstellar molecules">Interstellar and circumstellar molecules</a></li></ul>
</div></td></tr></tbody></table><div>
</div></td><td class="navbox-list" style="border-left:2px solid #fdfdfd;padding:0px;width:50%;"><div>
</div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="Ring_system" title="Ring system">Rings</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Ring_system#Ring_systems_of_planets" title="Ring system">Planetary</a>
<ul><li><a href="Rings_of_Jupiter" title="Rings of Jupiter">Jovian</a></li>
<li><a href="Rings_of_Saturn" title="Rings of Saturn">Saturnian</a> (<a href="Rings_of_Rhea" title="Rings of Rhea">Rhean</a>?)</li>
<li><a href="Rings_of_Uranus" title="Rings of Uranus">Uranian</a></li>
<li><a href="Rings_of_Neptune" title="Rings of Neptune">Neptunian</a></li></ul></li>
<li><a href="Ring_system#Rings_systems_of_minor_planets_and_moons" title="Ring system">Minor objects'</a>
<ul><li><a href="Rings_of_Chariklo" title="Rings of Chariklo">Charikloan</a></li>
<li><a href="2060_Chiron#Rings" title="2060 Chiron">Chironean</a></li>
<li><a href="Haumea#Ring" title="Haumea">Haumean</a></li>
<li><a href="Quaoar#Rings" title="Quaoar">Quaoarian</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="Formation_and_evolution_of_the_Solar_System" title="Formation and evolution of the Solar System">Formation,<br>evolution</a>, <br> contents, <br> and <br> <a href="History_of_Solar_System_formation_and_evolution_hypotheses" title="History of Solar System formation and evolution hypotheses">History</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Star_formation" title="Star formation">Star formation</a></li>
<li><a href="Accretion_(astrophysics)" title="Accretion (astrophysics)">Accretion</a></li>
<li><a href="Accretion_disk" title="Accretion disk">Accretion disk</a>
<ul><li><a href="Accretion_disk#Excretion_disk" title="Accretion disk">Excretion</a></li></ul></li>
<li><a href="History_of_Solar_System_formation_and_evolution_hypotheses#Capture_hypothesis" title="History of Solar System formation and evolution hypotheses">Capture theory</a>
<ul><li><a href="Capture_of_Triton" title="Capture of Triton">Capture of Triton</a></li></ul></li>
<li><a href="Circumplanetary_disk" title="Circumplanetary disk">Circumplanetary disk</a></li>
<li><a href="Circumstellar_disc" title="Circumstellar disc">Circumstellar disc</a></li>
<li><a href="Circumstellar_envelope" title="Circumstellar envelope">Circumstellar envelope</a></li>
<li><a href="Coatlicue_(star)" title="Coatlicue (star)">Coatlicue</a></li>
<li><a href="Co-orbital_configuration" title="Co-orbital configuration">Co-orbital configuration</a>
<ul><li><a href="Co-orbital_configuration#Trojan_moons" title="Co-orbital configuration">Trojan moons</a></li>
<li><a href="Co-orbital_configuration#Co-orbital_moons" title="Co-orbital configuration">Co-orbital moons</a></li></ul></li>
<li><a href="Cosmic_dust" title="Cosmic dust">Cosmic dust</a></li>
<li><a href="Debris_disk" title="Debris disk">Debris disk</a></li>
<li><a href="Detached_object" title="Detached object">Detached object</a></li>
<li><a href="Ice_giant#Disk_instability" title="Ice giant">Disk instability</a></li>
<li><a href="Exoplanetary_Circumstellar_Environments_and_Disk_Explorer" title="Exoplanetary Circumstellar Environments and Disk Explorer">EXCEDE</a></li>
<li><a href="Exozodiacal_dust" title="Exozodiacal dust">Exozodiacal dust</a></li>
<li><a href="Extraterrestrial_materials" title="Extraterrestrial materials">Extraterrestrial materials</a>
<ul><li><a href="Extraterrestrial_sample_curation" title="Extraterrestrial sample curation">Curation</a></li>
<li><a href="Sample-return_mission" title="Sample-return mission">Sample-return mission</a></li></ul></li>
<li><a href="Frost_line_(astrophysics)" title="Frost line (astrophysics)">Frost/Ice/Snow line</a></li>
<li><a href="Giant-impact_hypothesis" title="Giant-impact hypothesis">Giant-impact hypothesis</a></li>
<li><a href="Grand_tack_hypothesis" title="Grand tack hypothesis">Grand tack hypothesis</a></li>
<li><a href="Gravitational_collapse" title="Gravitational collapse">Gravitational collapse</a></li>
<li><a href="Hills_cloud" title="Hills cloud">Hills cloud</a></li>
<li><a href="Hill_sphere" title="Hill sphere">Hill sphere</a></li>
<li><a href="Interplanetary_dust_cloud" title="Interplanetary dust cloud">Interplanetary dust cloud</a></li>
<li><a href="Interplanetary_medium" title="Interplanetary medium">Interplanetary medium/space</a></li>
<li><a href="Interstellar_cloud" title="Interstellar cloud">Interstellar cloud</a></li>
<li><a href="Interstellar_medium" title="Interstellar medium">Interstellar medium</a></li>
<li><a href="Outer_space#Interstellar_space" title="Outer space">Interstellar space</a></li>
<li><a href="Kordylewski_cloud" title="Kordylewski cloud">Kordylewski cloud</a></li>
<li><a href="Kuiper_belt" title="Kuiper belt">Kuiper belt</a></li>
<li><a href="Kuiper_cliff" class="mw-redirect" title="Kuiper cliff">Kuiper cliff</a></li>
<li><a href="Late_Heavy_Bombardment" title="Late Heavy Bombardment">Late Heavy Bombardment</a></li>
<li><a href="Molecular_cloud" title="Molecular cloud">Molecular cloud</a></li>
<li><a href="Nebular_hypothesis" title="Nebular hypothesis">Nebular hypothesis</a></li>
<li><a href="Nice_model" title="Nice model">Nice model</a>
<ul><li><a href="Nice_2_model" title="Nice 2 model">Nice 2 model</a></li>
<li><a href="Five-planet_Nice_model" title="Five-planet Nice model">Five-planet Nice model</a></li></ul></li>
<li><a href="Oort_cloud" title="Oort cloud">Oort cloud</a></li>
<li><a href="Outer_space" title="Outer space">Outer space</a></li>
<li><a href="Planet" title="Planet">Planet</a>
<ul><li><a href="Disrupted_planet" title="Disrupted planet">Disrupted</a></li>
<li><a href="Planetary_migration" title="Planetary migration">Migration</a></li>
<li><a href="Planetary_system" title="Planetary system">System</a></li>
<li><a href="Planetesimal" title="Planetesimal">Planetesimal</a></li>
<li><a href="Nebular_hypothesis#Formation_of_planets" title="Nebular hypothesis">Formation</a>
<ul><li><a href="Stellar_collision#Formation_of_planets" title="Stellar collision">Merging stars</a></li></ul></li>
<li><a href="Protoplanetary_disk" title="Protoplanetary disk">Protoplanetary disk</a></li></ul></li>
<li><a href="Ring_system" title="Ring system">Ring system</a></li>
<li><a href="Roche_limit" title="Roche limit">Roche limit</a>
<ul><li><a href="Roche_limit#Roche_limit,_Hill_sphere_and_radius_of_the_planet" title="Roche limit">vs. Hill sphere</a></li></ul></li>
<li><a href="Rubble_pile" title="Rubble pile">Rubble pile</a></li>
<li><a href="Scattered_disc" title="Scattered disc">Scattered disc</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="Small_Solar_System_body" title="Small Solar System body">Small<br>Solar<br>System<br>bodies</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Asteroid_belt" title="Asteroid belt">Asteroid belt</a></li>
<li><a href="Asteroid" title="Asteroid">Asteroids</a>
<ul><li><a href="Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></li>
<li><a href="4_Vesta" title="4 Vesta">Vesta</a></li>
<li><a href="2_Pallas" title="2 Pallas">Pallas</a></li>
<li><a href="10_Hygiea" title="10 Hygiea">Hygiea</a></li>
<li><a href="Active_asteroid" title="Active asteroid">active</a></li>
<li><a href="List_of_minor_planets" title="List of minor planets">List</a></li>
<li><a href="Asteroid_family" title="Asteroid family">families</a></li>
<li><a href="Potentially_hazardous_object" title="Potentially hazardous object">PHA</a></li>
<li><a href="List_of_exceptional_asteroids" title="List of exceptional asteroids">exceptional</a></li>
<li><a href="Kirkwood_gap" title="Kirkwood gap">Kirkwood gap</a></li></ul></li>
<li><a href="Centaur_(small_Solar_System_body)" title="Centaur (small Solar System body)">Centaurs</a></li>
<li><a href="Comet" title="Comet">Comets</a></li>
<li><a href="Damocloid" title="Damocloid">Damocloids</a></li>
<li><a href="Meteoroid" title="Meteoroid">Meteoroids</a></li>
<li><a href="Minor_planet" title="Minor planet">Minor planets</a>
<ul><li><a href="Meanings_of_minor-planet_names" title="Meanings of minor-planet names">names and meanings</a></li>
<li><a href="Minor-planet_moon" title="Minor-planet moon">moons</a></li></ul></li>
<li><a href="Planetesimal" title="Planetesimal">Planetesimal</a></li>
<li>Planetary orbit-crossers
<ul><li><a href="List_of_Mercury-crossing_minor_planets" title="List of Mercury-crossing minor planets">Mercury</a></li>
<li><a href="List_of_Venus-crossing_minor_planets" title="List of Venus-crossing minor planets">Venus</a></li>
<li><a href="List_of_Earth-crossing_asteroids" title="List of Earth-crossing asteroids">Earth</a></li>
<li><a href="List_of_Mars-crossing_minor_planets" title="List of Mars-crossing minor planets">Mars</a></li>
<li><a href="List_of_Jupiter-crossing_minor_planets" title="List of Jupiter-crossing minor planets">Jupiter</a></li>
<li><a href="List_of_Saturn-crossing_minor_planets" title="List of Saturn-crossing minor planets">Saturn</a></li>
<li><a href="List_of_Uranus-crossing_minor_planets" title="List of Uranus-crossing minor planets">Uranus</a></li>
<li><a href="List_of_Neptune-crossing_minor_planets" title="List of Neptune-crossing minor planets">Neptune</a></li></ul></li>
<li><a href="Trojan_(celestial_body)" title="Trojan (celestial body)">Trojans</a>
<ul><li><a href="2013_ND15" title="2013 ND15">Venus</a></li>
<li><a href="Earth_trojan" title="Earth trojan">Earth</a></li>
<li><a href="Mars_trojan" title="Mars trojan">Mars</a></li>
<li><a href="Jupiter_trojan" title="Jupiter trojan">Jupiter</a>
<ul><li><a href="List_of_Jupiter_trojans_(Trojan_camp)" title="List of Jupiter trojans (Trojan camp)">Trojan camp</a></li>
<li><a href="List_of_Jupiter_trojans_(Greek_camp)" title="List of Jupiter trojans (Greek camp)">Greek camp</a></li></ul></li>
<li><a href="2019_UO14" title="2019 UO14">Saturn</a></li>
<li><a href="Uranus_trojans" title="Uranus trojans">Uranus</a></li>
<li><a href="Neptune_trojan" title="Neptune trojan">Neptune</a></li></ul></li>
<li><a href="Near-Earth_object" title="Near-Earth object">Near-Earth objects</a>
<ul><li><a href="Near-Earth_object#Near-Earth_asteroids" title="Near-Earth object">NEAs</a></li></ul></li>
<li><a href="Trans-Neptunian_object" title="Trans-Neptunian object">Trans-Neptunian objects</a>
<ul><li><a href="Kuiper_belt" title="Kuiper belt">Kuiper belt</a>
<ul><li><a href="Classical_Kuiper_belt_object" title="Classical Kuiper belt object">Cubewanos</a></li>
<li><a href="Plutino" title="Plutino">Plutinos</a></li></ul></li>
<li><a href="Detached_object" title="Detached object">Detached objects</a></li>
<li><a href="Sednoid" title="Sednoid">Sednoids</a></li>
<li><a href="Scattered_disc" title="Scattered disc">Scattered disc</a></li>
<li><a href="Hills_cloud" title="Hills cloud">Hills cloud</a></li>
<li><a href="Oort_cloud" title="Oort cloud">Oort cloud</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Related</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Double_planet" title="Double planet">Double planet</a></li>
<li><a href="Lagrange_point" title="Lagrange point">Lagrange point</a></li>
<li><a href="Moonlet" title="Moonlet">Moonlet</a></li>
<li><a href="Syzygy_(astronomy)" title="Syzygy (astronomy)">Syzygy</a></li>
<li><a href="Tidal_locking" title="Tidal locking">Tidal locking</a></li></ul>
</div></td></tr></tbody></table><div>
</div></td></tr></tbody></table></div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align:center;;padding:0.4em;line-height:1.25em;"><div>
<ul><li><a href="Outline_of_the_Solar_System" title="Outline of the Solar System">Outline of the Solar System</a></li>
<li><span class="nowrap"><span class="noviewer" typeof="mw:File"><span></span></span> </span><a href="Portal%3ASolar_System" title="Portal:Solar System">Solar System portal</a></li>
<li><span class="nowrap"><span class="noviewer" typeof="mw:File"><span></span></span> </span><a href="Portal%3AAstronomy" title="Portal:Astronomy">Astronomy portal</a></li>
<li><span class="nowrap"><span class="noviewer" typeof="mw:File"><span></span></span> </span><a href="Portal%3AEarth_sciences" title="Portal:Earth sciences">Earth sciences portal</a></li></ul>
<p> <span style="font-size:120%">→</span> <a href="Local_Interstellar_Cloud" title="Local Interstellar Cloud">Local Interstellar Cloud</a> <span style="font-size:120%">→</span> <a href="Local_Bubble" title="Local Bubble">Local Bubble</a> <span style="font-size:120%">→</span> <a href="Gould_Belt" title="Gould Belt">Gould Belt</a> <span style="font-size:120%">→</span> <a href="Orion_Arm" title="Orion Arm">Orion Arm</a> <span style="font-size:120%">→</span> <a href="Milky_Way" title="Milky Way">Milky Way</a> <span style="font-size:120%">→</span> <a href="Satellite_galaxies_of_the_Milky_Way" title="Satellite galaxies of the Milky Way">Milky Way subgroup</a> <span style="font-size:120%">→</span> <a href="Local_Group" title="Local Group">Local Group</a> <span style="font-size:120%">→</span> <a href="Local_Sheet" title="Local Sheet">Local Sheet</a> <span style="font-size:120%">→</span> <a href="Virgo_Supercluster" title="Virgo Supercluster">Virgo Supercluster</a> <span style="font-size:120%">→</span> <a href="Laniakea_Supercluster" title="Laniakea Supercluster">Laniakea Supercluster</a> <span style="font-size:120%">→</span> <a href="Local_Hole" title="Local Hole">Local Hole</a> <span style="font-size:120%">→</span> <a href="Observable_universe" title="Observable universe">Observable universe</a> <span style="font-size:120%">→</span> <a href="Universe" title="Universe">Universe</a><br><span style="font-size: 85%;">Each arrow (<span style="font-size:120%">→</span>) may be read as "within" or "part of".</span>
</p>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Location_of_Earth255" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Location_of_Earth255" style="font-size:114%;margin:0 4em"><a href="Location_of_Earth" title="Location of Earth">Location of Earth</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Included</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><a href="Earth" title="Earth">Earth</a> <span style="font-size:120%">→</span> <span style="font-size:120%">→</span> <a href="Local_Interstellar_Cloud" title="Local Interstellar Cloud">Local Interstellar Cloud</a> <span style="font-size:120%">→</span> <a href="Local_Bubble" title="Local Bubble">Local Bubble</a> <span style="font-size:120%">→</span> <a href="Gould_Belt" title="Gould Belt">Gould Belt</a> <span style="font-size:120%">→</span> <a href="Orion_Arm" title="Orion Arm">Orion Arm</a> <span style="font-size:120%">→</span> <a href="Milky_Way" title="Milky Way">Milky Way</a> <span style="font-size:120%">→</span> <a href="Satellite_galaxies_of_the_Milky_Way" title="Satellite galaxies of the Milky Way">Milky Way subgroup</a> <span style="font-size:120%">→</span> <a href="Local_Group" title="Local Group">Local Group</a> <span style="font-size:120%">→</span> <a href="Local_Sheet" title="Local Sheet">Local Sheet</a> <span style="font-size:120%">→</span> <a href="Virgo_Supercluster" title="Virgo Supercluster">Virgo Supercluster</a> <span style="font-size:120%">→</span> <a href="Laniakea_Supercluster" title="Laniakea Supercluster">Laniakea Supercluster</a> <span style="font-size:120%">→</span> <a href="Local_Hole" title="Local Hole">Local Hole</a> <span style="font-size:120%">→</span> <a href="Observable_universe" title="Observable universe">Observable universe</a> <span style="font-size:120%">→</span> <a href="Universe" title="Universe">Universe</a><br><span style="font-size: 85%;">Each arrow (<span style="font-size:120%">→</span>) may be read as "within" or "part of".</span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Cosmic_View" title="Cosmic View"><i>Cosmic View</i> (1957 book)</a></li>
<li><a href="To_the_Moon_and_Beyond" title="To the Moon and Beyond"><i>To the Moon and Beyond</i> (1964 film)</a></li>
<li><a href="Cosmic_Zoom" title="Cosmic Zoom"><i>Cosmic Zoom</i> (1968 film)</a></li>
<li><a href="Powers_of_Ten_(film_series)" title="Powers of Ten (film series)"><i>Powers of Ten</i> (1968 and 1977 films)</a></li>
<li><a href="Cosmic_Voyage_(1996_film)" title="Cosmic Voyage (1996 film)"><i>Cosmic Voyage</i> (1996 documentary)</a></li>
<li><a href="Cosmic_Eye" title="Cosmic Eye"><i>Cosmic Eye</i> (2012)</a></li>
<li><a href="Center_of_the_universe" title="Center of the universe">Center of the universe</a></li>
<li><a href="Order_of_magnitude" title="Order of magnitude">Order of magnitude</a></li>
<li><a href="Pisces%E2%80%93Cetus_Supercluster_Complex" title="Pisces–Cetus Supercluster Complex">Pisces–Cetus Supercluster Complex</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><b><span class="noviewer" typeof="mw:File"></span> <a href="Portal%3AAstronomy" title="Portal:Astronomy">Astronomy portal</a></b></li>
<li><b><span class="noviewer" typeof="mw:File"></span> <a href="Portal%3ASpace" class="mw-redirect" title="Portal:Space">Space portal</a></b></li></ul>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Astronomy559" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="text-align: center;"><div id="Astronomy559" style="font-size:114%;margin:0 4em"><a href="Astronomy" title="Astronomy">Astronomy</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align: center;"><div>
<ul><li><a href="Outline_of_astronomy" title="Outline of astronomy">Outline</a></li>
<li><a href="History_of_astronomy" title="History of astronomy">History</a>
<ul><li><a href="Timeline_of_astronomy" title="Timeline of astronomy">Timeline</a></li></ul></li>
<li><a href="Astronomer" title="Astronomer">Astronomer</a></li>
<li><a href="Astronomical_symbols" title="Astronomical symbols">Astronomical symbols</a></li>
<li><a href="Astronomical_object" title="Astronomical object">Astronomical object</a></li>
<li><a href="Glossary_of_astronomy" title="Glossary of astronomy">Glossary</a></li>
<li><a href="List_of_topics_in_space" title="List of topics in space">... in space</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Astronomy by</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;">Manner</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Amateur_astronomy" title="Amateur astronomy">Amateur</a></li>
<li><a href="Observational_astronomy" title="Observational astronomy">Observational</a></li>
<li><a href="Sidewalk_astronomy" title="Sidewalk astronomy">Sidewalk</a></li>
<li><a href="Space_telescope" title="Space telescope">Space telescope</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;">Celestial subject</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Galactic_astronomy" title="Galactic astronomy">Galactic</a> / <a href="Extragalactic_astronomy" title="Extragalactic astronomy">Extragalactic</a></li>
<li>
<ul><li><a href="Sun" title="Sun">Solar</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;">EM methods</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Radio_astronomy" title="Radio astronomy">Radio</a></li>
<li><a href="Submillimetre_astronomy" title="Submillimetre astronomy">Submillimetre</a></li>
<li><a href="Infrared_astronomy" title="Infrared astronomy">Infrared</a> (<span style="font-size: 85%;"><a href="Far-infrared_astronomy" title="Far-infrared astronomy">Far-infrared</a></span>)</li>
<li><a href="Visible-light_astronomy" title="Visible-light astronomy">Visible-light <span style="font-size: 85%;">(optical)</span></a></li>
<li><a href="Ultraviolet_astronomy" title="Ultraviolet astronomy">Ultraviolet</a></li>
<li><a href="X-ray_astronomy" title="X-ray astronomy">X-ray</a>
<ul><li><a href="History_of_X-ray_astronomy" title="History of X-ray astronomy">History</a></li></ul></li>
<li><a href="Gamma-ray_astronomy" title="Gamma-ray astronomy">Gamma-ray</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;">Other methods</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Neutrino_astronomy" title="Neutrino astronomy">Neutrino</a></li>
<li><a href="Cosmic_ray_astronomy" title="Cosmic ray astronomy">Cosmic rays</a></li>
<li><a href="Gravitational-wave_astronomy" title="Gravitational-wave astronomy">Gravitational radiation</a></li>
<li><a href="High-energy_astronomy" title="High-energy astronomy">High-energy</a></li>
<li><a href="Radar_astronomy" title="Radar astronomy">Radar</a></li>
<li><a href="Spherical_astronomy" title="Spherical astronomy">Spherical</a></li>
<li><a href="Multi-messenger_astronomy" title="Multi-messenger astronomy">Multi-messenger</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;font-weight:normal; text-align: center;"><a href="Cultural_astronomy" title="Cultural astronomy">Culture</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Australian_Aboriginal_astronomy" title="Australian Aboriginal astronomy">Australian Aboriginal</a></li>
<li><a href="Babylonian_astronomy" title="Babylonian astronomy">Babylonian</a></li>
<li><a href="Chinese_astronomy" title="Chinese astronomy">Chinese</a></li>
<li><a href="Egyptian_astronomy" title="Egyptian astronomy">Egyptian</a></li>
<li><a href="Ancient_Greek_astronomy" title="Ancient Greek astronomy">Greek</a></li>
<li><a href="Hebrew_astronomy" title="Hebrew astronomy">Hebrew</a></li>
<li><a href="Indian_astronomy" title="Indian astronomy">Indian</a></li>
<li><a href="Inuit_astronomy" title="Inuit astronomy">Inuit</a></li>
<li><a href="Maya_astronomy" title="Maya astronomy">Maya</a></li>
<li><a href="Astronomy_in_the_medieval_Islamic_world" title="Astronomy in the medieval Islamic world">Medieval Islamic</a></li>
<li><a href="Persian_astronomy" title="Persian astronomy">Persian</a></li>
<li><a href="Astronomy_in_Serbia" title="Astronomy in Serbia">Serbian</a>
<ul><li><a href="Serbian_folk_astronomy" title="Serbian folk astronomy">folk</a></li></ul></li>
<li><a href="Tibetan_astronomy" title="Tibetan astronomy">Tibetan</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="Optical_telescope" title="Optical telescope">Optical<br>telescopes</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="List_of_optical_telescopes" title="List of optical telescopes">List</a></li>
<li>Category</li>
<li><a href="Extremely_large_telescope" title="Extremely large telescope">Extremely large telescope</a></li>
<li><a href="Extremely_Large_Telescope" title="Extremely Large Telescope">Extremely Large Telescope</a></li>
<li><a href="Gran_Telescopio_Canarias" title="Gran Telescopio Canarias">Gran Telescopio Canarias</a></li>
<li><a href="Hale_Telescope" title="Hale Telescope">Hale Telescope</a></li>
<li><a href="Hubble_Space_Telescope" title="Hubble Space Telescope">Hubble Space Telescope</a></li>
<li><a href="W._M._Keck_Observatory" title="W. M. Keck Observatory">Keck Observatory</a></li>
<li><a href="Large_Binocular_Telescope" title="Large Binocular Telescope">Large Binocular Telescope</a></li>
<li><a href="Southern_African_Large_Telescope" title="Southern African Large Telescope">Southern African Large Telescope</a></li>
<li><a href="Very_Large_Telescope" title="Very Large Telescope">Very Large Telescope</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Archaeoastronomy" title="Archaeoastronomy">Archaeoastronomy</a></li>
<li><a href="Astrobiology" title="Astrobiology">Astrobiology</a></li>
<li><a href="Astrochemistry" title="Astrochemistry">Astrochemistry</a></li>
<li><a href="Astroinformatics" title="Astroinformatics">Astroinformatics</a></li>
<li><a href="Astrology_and_astronomy" title="Astrology and astronomy">Astrology and astronomy</a></li>
<li><a href="Astrometry" title="Astrometry">Astrometry</a></li>
<li><i><a href="Astronomers_Monument" title="Astronomers Monument">Astronomers Monument</a></i></li>
<li><a href="Astroparticle_physics" title="Astroparticle physics">Astroparticle physics</a></li>
<li><a href="Astrophysics" title="Astrophysics">Astrophysics</a></li>
<li><a href="Astrotourism" title="Astrotourism">Astrotourism</a></li>
<li><a href="Binoculars" title="Binoculars">Binoculars</a></li>
<li><a href="Constellation" title="Constellation">Constellation</a>
<ul><li><a href="IAU_designated_constellations" title="IAU designated constellations">IAU</a></li></ul></li>
<li><a href="Cosmogony" title="Cosmogony">Cosmogony</a></li>
<li><a href="Photometry_(astronomy)" title="Photometry (astronomy)">Photometry</a></li>
<li><a href="Planetarium" title="Planetarium">Planetarium</a></li>
<li><a href="Planetary_geology" title="Planetary geology">Planetary geology</a></li>
<li><a href="Physical_cosmology" title="Physical cosmology">Physical cosmology</a></li>
<li><a href="Quantum_cosmology" title="Quantum cosmology">Quantum cosmology</a></li>
<li><a href="List_of_astronomers" title="List of astronomers">List of astronomers</a>
<ul><li><a href="List_of_French_astronomers" title="List of French astronomers">French</a></li>
<li><a href="Astronomy_in_the_medieval_Islamic_world#Notable_astronomers" title="Astronomy in the medieval Islamic world">Medieval Islamic</a></li>
<li><a href="List_of_Russian_astronomers_and_astrophysicists" title="List of Russian astronomers and astrophysicists">Russian</a></li>
<li><a href="List_of_women_astronomers" title="List of women astronomers">Women</a></li></ul></li>
<li><a href="Telescope" title="Telescope">Telescope</a>
<ul><li><a href="X-ray_telescope" title="X-ray telescope">X-ray telescope</a></li>
<li><a href="History_of_the_telescope" title="History of the telescope">history</a></li>
<li><a href="Lists_of_telescopes" title="Lists of telescopes">lists</a></li></ul></li>
<li><a href="Zodiac" title="Zodiac">Zodiac</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align: center;"><div>
<ul><li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</li>
<li><span class="noviewer" typeof="mw:File"><span title="Commons page"></span></span> <a href="https://commons.wikimedia.org/wiki/Category:Astronomy" class="extiw external" title="commons:Category:Astronomy">Commons</a></li></ul>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="_Celestial_objects_within_10_light-years_→163" style="padding:3px"><table class="nowraplinks mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="_Celestial_objects_within_10_light-years_→163" style="font-size:114%;margin:0 4em"> Celestial objects within 10 light-years →</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Primary_member_type175" scope="row" class="navbox-group" style="width:17em"><span class="nobold"><abbr title="Primary member of a system is the brightest one (and, in most cases, also the most massive one).">Primary</abbr> member <a href="Stellar_classification" title="Stellar classification">type</a></span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td class="navbox-abovebelow" colspan="2" style="text-align:left;"><div id="Celestial_objects_by_systems.29">Celestial objects by systems.</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Main-sequencestars42" scope="row" class="navbox-group" style="width:8em;line-height:0.7em;"><a href="Main_sequence" title="Main sequence">Main-sequence<br>stars</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6.85em;line-height:0.7em;"><a href="A-type_main-sequence_star" title="A-type main-sequence star">A-type</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Sirius" title="Sirius">Sirius (Alpha Canis Majoris)</a> (8.7094<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0054 ly)</li>
<li>white dwarf B</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.85em;line-height:0.7em;"><a href="G-type_main-sequence_star" title="G-type main-sequence star">G-type</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Sun" title="Sun">Sun</a> (0 ly)</li>
<li><span style="font-size: 85%;"><abbr title="8 planets; over 1,100,000 minor planets (including 5 dwarf planets); over 5000 comets; 206 moons of planets; over 200 moons of minor planets (including 9 moons of dwarf planets); bodies of planetary rings (mostly were observed rings, not separate bodies, but over 150 moonlets were observed); numerous small bodies, observed as meteors and meteorites, but not catalogued as minor planets or comets; spacecraft; space debris; cosmonauts. Some known comets and spacecrafts, currently located within Solar System boundaries, are not gravitationally bound with the Sun, and therefore formally are separate (interstellar) objects.">rest</abbr> of </span></li>
<li>Alpha Centauri
<ul><li><a href="Alpha_Centauri" title="Alpha Centauri">α Cen (Rigil Kentaurus)</a> (4.3441<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0022 ly)</li></ul></li>
<li>K-type main-sequence star B (Toliman)</li>
<li>red dwarf <a href="Proxima_Centauri" title="Proxima Centauri">C (Proxima Centauri)</a> (4.2465 ± 0.0003 ly)</li>
<li>2 (5?) planets: <a href="Alpha_Centauri_Ab" title="Alpha Centauri Ab">Ab</a>?; Bc?; <a href="Proxima_Centauri_b" title="Proxima Centauri b">Cb</a>, <a href="Proxima_Centauri_c" title="Proxima Centauri c">Cc</a>?, <a href="Proxima_Centauri_d" title="Proxima Centauri d">Cd</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.85em;line-height:0.7em;"><a href="Red_dwarf" title="Red dwarf">M-type<br><span class="nobold">(red dwarfs)</span></a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Barnard's_Star" title="Barnard's Star">Barnard's Star</a> (5.9629<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0004 ly)</li>
<li>4 planets: <a href="Barnard's_Star_b" title="Barnard's Star b">b</a>, c, d, e</li>
<li><a href="Wolf_359" title="Wolf 359">Wolf 359</a> (7.8558<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0013 ly)</li>
<li>1? planets: b?</li>
<li><a href="Lalande_21185" title="Lalande 21185">Lalande 21185</a> (8.3044<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0007 ly)</li>
<li>2 (3?) planets: b, d?, c</li>
<li><a href="Gliese_65" title="Gliese 65">Gliese 65 A (BL Ceti)</a> (8.724<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.012 ly)</li>
<li>red dwarf B (UV Ceti)</li>
<li>1? planets: b?</li>
<li><a href="Ross_154" title="Ross 154">Ross 154</a> (9.7063<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0009 ly)</li></ul>
</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Brown_dwarfs16" scope="row" class="navbox-group" style="width:10em"><a href="Brown_dwarf" title="Brown dwarf">Brown dwarfs</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="L-type117" scope="row" class="navbox-group" style="width:4.85em"><a href="Brown_dwarf#Spectral_class_L" title="Brown dwarf">L-type</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Luhman_16" title="Luhman 16">Luhman 16</a> (6.5029<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.0011 ly)</li>
<li>T-type brown dwarf B</li></ul>
</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Sub-brown_dwarfsand_rogue_planets46" scope="row" class="navbox-group" style="width:10em;line-height:0.7em;"><a href="Sub-brown_dwarf" title="Sub-brown dwarf">Sub-brown dwarfs</a><br>and <a href="Rogue_planet" title="Rogue planet">rogue planets</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Y-type6" scope="row" class="navbox-group" style="width:4.85em">Y-type</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em">
<ul><li><a href="WISE_0855%E2%88%920714" title="WISE 0855−0714">WISE 0855−0714</a> (7.430<span style="margin-left:0.3em;margin-right:0.15em">±</span>0.041 ly)</li></ul>
</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Stars520" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Stars520" style="font-size:114%;margin:0 4em"><a href="Star" title="Star">Stars</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><a href="Lists_of_stars" title="Lists of stars">List</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Star_formation" title="Star formation">Formation</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Accretion_(astrophysics)" title="Accretion (astrophysics)">Accretion</a></li>
<li><a href="Molecular_cloud" title="Molecular cloud">Molecular cloud</a></li>
<li><a href="Bok_globule" title="Bok globule">Bok globule</a></li>
<li><a href="Young_stellar_object" title="Young stellar object">Young stellar object</a>
<ul><li><a href="Protostar" title="Protostar">Protostar</a></li>
<li><a href="Pre-main-sequence_star" title="Pre-main-sequence star">Pre-main-sequence</a></li>
<li><a href="Herbig_Ae/Be_star" title="Herbig Ae/Be star">Herbig Ae/Be</a></li>
<li><a href="T_Tauri_star" title="T Tauri star">T Tauri</a></li></ul></li>
<li><a href="Herbig%E2%80%93Haro_object" title="Herbig–Haro object">Herbig–Haro object</a></li>
<li><a href="Hayashi_track" title="Hayashi track">Hayashi track</a></li>
<li><a href="Henyey_track" title="Henyey track">Henyey track</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_evolution" title="Stellar evolution">Evolution</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Main_sequence" title="Main sequence">Main sequence</a></li>
<li><a href="Red-giant_branch" title="Red-giant branch">Red-giant branch</a></li>
<li><a href="Horizontal_branch" title="Horizontal branch">Horizontal branch</a>
<ul><li><a href="Red_clump" title="Red clump">Red clump</a></li></ul></li>
<li><a href="Asymptotic_giant_branch" title="Asymptotic giant branch">Asymptotic giant branch</a>
<ul><li><a href="Post-AGB_star" title="Post-AGB star">post-AGB</a></li>
<li><a href="Super-AGB_star" title="Super-AGB star">super-AGB</a></li></ul></li>
<li><a href="Blue_loop" title="Blue loop">Blue loop</a></li>
<li><a href="Planetary_nebula" title="Planetary nebula">Planetary nebula</a>
<ul><li><a href="Protoplanetary_nebula" title="Protoplanetary nebula">Protoplanetary</a></li></ul></li>
<li><a href="Wolf%E2%80%93Rayet_nebula" title="Wolf–Rayet nebula">Wolf–Rayet nebula</a></li>
<li><a href="PG_1159_star" title="PG 1159 star">PG1159</a></li>
<li><a href="Dredge-up" title="Dredge-up">Dredge-up</a></li>
<li><a href="OH/IR_star" title="OH/IR star">OH/IR</a></li>
<li><a href="Instability_strip" title="Instability strip">Instability strip</a></li>
<li><a href="Luminous_blue_variable" title="Luminous blue variable">Luminous blue variable</a></li>
<li><a href="Stellar_population" title="Stellar population">Stellar population</a></li>
<li><a href="Supernova" title="Supernova">Supernova</a>
<ul><li><a href="Superluminous_supernova" title="Superluminous supernova">Superluminous</a></li>
<li><a href="Hypernova" title="Hypernova">Hypernova</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_classification" title="Stellar classification">Classification</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Early-type_star" class="mw-redirect" title="Early-type star">Early</a></li>
<li><a href="Late-type_star" class="mw-redirect" title="Late-type star">Late</a></li>
<li>Main sequence
<ul><li><a href="O-type_main-sequence_star" title="O-type main-sequence star">O</a></li>
<li><a href="B-type_main-sequence_star" title="B-type main-sequence star">B</a></li>
<li><a href="A-type_main-sequence_star" title="A-type main-sequence star">A</a></li>
<li><a href="F-type_main-sequence_star" title="F-type main-sequence star">F</a></li>
<li><a href="G-type_main-sequence_star" title="G-type main-sequence star">G</a></li>
<li><a href="K-type_main-sequence_star" title="K-type main-sequence star">K</a></li>
<li><a href="Red_dwarf" title="Red dwarf">M</a></li></ul></li>
<li><a href="Subdwarf" title="Subdwarf">Subdwarf</a>
<ul><li><a href="Subdwarf_O_star" title="Subdwarf O star">O</a></li>
<li><a href="Subdwarf_B_star" title="Subdwarf B star">B</a></li></ul></li>
<li><a href="Wolf%E2%80%93Rayet_star" title="Wolf–Rayet star">WR</a></li>
<li><a href="OB_star" title="OB star">OB</a></li>
<li><a href="Subgiant" title="Subgiant">Subgiant</a></li>
<li><a href="Giant_star" title="Giant star">Giant</a>
<ul><li><a href="Blue_giant" title="Blue giant">Blue</a></li>
<li><a href="Red_giant" title="Red giant">Red</a></li>
<li><a href="Yellow_giant" class="mw-redirect" title="Yellow giant">Yellow</a></li></ul></li>
<li><a href="Bright_giant" class="mw-redirect" title="Bright giant">Bright giant</a></li>
<li><a href="Supergiant" title="Supergiant">Supergiant</a>
<ul><li><a href="Blue_supergiant" title="Blue supergiant">Blue</a></li>
<li><a href="Red_supergiant" title="Red supergiant">Red</a></li>
<li><a href="Yellow_supergiant" title="Yellow supergiant">Yellow</a></li></ul></li>
<li><a href="Hypergiant" title="Hypergiant">Hypergiant</a>
<ul><li><a href="Yellow_hypergiant" title="Yellow hypergiant">Yellow</a></li></ul></li>
<li><a href="Carbon_star" title="Carbon star">Carbon</a>
<ul><li><a href="S-type_star" title="S-type star">S</a></li>
<li><a href="CN_star" title="CN star">CN</a></li>
<li><a href="CH_star" title="CH star">CH</a></li></ul></li>
<li><a href="White_dwarf" title="White dwarf">White dwarf</a></li>
<li><a href="Chemically_peculiar_star" title="Chemically peculiar star">Chemically peculiar</a>
<ul><li><a href="Am_star" title="Am star">Am</a></li>
<li><a href="Ap_and_Bp_stars" title="Ap and Bp stars">Ap/Bp</a></li>
<li><a href="CEMP_star" title="CEMP star">CEMP</a></li>
<li><a href="Mercury-manganese_star" title="Mercury-manganese star">HgMn</a></li>
<li><a href="Helium-weak_star" title="Helium-weak star">He-weak</a></li>
<li><a href="Barium_star" title="Barium star">Barium</a></li>
<li><a href="Lambda_Bo%C3%B6tis_star" title="Lambda Boötis star">Lambda Boötis</a></li>
<li><a href="Lead_star" title="Lead star">Lead</a></li>
<li><a href="Technetium_star" title="Technetium star">Technetium</a></li></ul></li>
<li><a href="Be_star" title="Be star">Be</a>
<ul><li><a href="Shell_star" title="Shell star">Shell</a></li></ul></li>
<li><a href="B(e)_star" title="B(e) star">B[e]</a></li>
<li><a href="Helium_star" title="Helium star">Helium</a>
<ul><li><a href="Extreme_helium_star" title="Extreme helium star">Extreme</a></li></ul></li>
<li><a href="Blue_straggler" title="Blue straggler">Blue straggler</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Compact_star" class="mw-redirect" title="Compact star">Remnants</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Compact_star" class="mw-redirect" title="Compact star">Compact star</a></li>
<li><a href="IRAS_00500%2B6713" title="IRAS 00500+6713">Parker's star</a></li>
<li><a href="White_dwarf" title="White dwarf">White dwarf</a>
<ul><li><a href="Helium_planet" title="Helium planet">Helium planet</a></li></ul></li>
<li><a href="Neutron_star" title="Neutron star">Neutron</a>
<ul><li><a href="Radio-quiet_neutron_star" title="Radio-quiet neutron star">Radio-quiet</a></li>
<li><a href="Pulsar" title="Pulsar">Pulsar</a>
<ul><li><a href="Binary_pulsar" title="Binary pulsar">Binary</a></li>
<li><a href="X-ray_pulsar" title="X-ray pulsar">X-ray</a></li></ul></li>
<li><a href="Magnetar" title="Magnetar">Magnetar</a></li></ul></li>
<li><a href="Stellar_black_hole" title="Stellar black hole">Stellar black hole</a></li>
<li><a href="X-ray_binary" title="X-ray binary">X-ray binary</a>
<ul><li><a href="X-ray_burster" title="X-ray burster">Burster</a></li></ul></li>
<li><a href="Soft_gamma_repeater" title="Soft gamma repeater">SGR</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Hypothetical_star" title="Hypothetical star">Hypothetical</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Blue_dwarf_(red-dwarf_stage)" title="Blue dwarf (red-dwarf stage)">Blue dwarf</a></li>
<li><a href="Black_dwarf" title="Black dwarf">Black dwarf</a></li>
<li><a href="Exotic_star" title="Exotic star">Exotic</a>
<ul><li><a href="Boson_star" class="mw-redirect" title="Boson star">Boson</a></li>
<li><a href="Electroweak_star" class="mw-redirect" title="Electroweak star">Electroweak</a></li>
<li><a href="Strange_star" title="Strange star">Strange</a></li>
<li><a href="Preon_star" class="mw-redirect" title="Preon star">Preon</a></li>
<li><a href="Planck_star" title="Planck star">Planck</a></li>
<li><a href="Dark_star_(dark_matter)" title="Dark star (dark matter)">Dark</a></li>
<li><a href="Dark-energy_star" title="Dark-energy star">Dark-energy</a></li>
<li><a href="Quark_star" title="Quark star">Quark</a></li>
<li><a href="Q_star" title="Q star">Q</a></li></ul></li>
<li>Black hole star
<ul><li><a href="Black_star_(semiclassical_gravity)" title="Black star (semiclassical gravity)">Black</a></li>
<li>Hawking</li>
<li><a href="Quasi-star" title="Quasi-star">Quasi-star</a></li></ul></li>
<li><a href="Gravastar" title="Gravastar">Gravastar</a></li>
<li><a href="Thorne%E2%80%93%C5%BBytkow_object" title="Thorne–Żytkow object">Thorne–Żytkow object</a></li>
<li><a href="Iron_star" title="Iron star">Iron</a></li>
<li><a href="Blitzar" title="Blitzar">Blitzar</a></li>
<li><a href="White_hole" title="White hole">White hole</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_nucleosynthesis" title="Stellar nucleosynthesis">Nucleosynthesis</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Deuterium_fusion" title="Deuterium fusion">Deuterium burning</a></li>
<li><a href="Lithium_burning" title="Lithium burning">Lithium burning</a></li>
<li><a href="Proton%E2%80%93proton_chain" title="Proton–proton chain">Proton–proton chain</a></li>
<li><a href="CNO_cycle" title="CNO cycle">CNO cycle</a></li>
<li><a href="Helium_flash" title="Helium flash">Helium flash</a></li>
<li><a href="Triple-alpha_process" title="Triple-alpha process">Triple-alpha process</a></li>
<li><a href="Alpha_process" title="Alpha process">Alpha process</a></li>
<li><a href="Carbon-burning_process" title="Carbon-burning process">C burning</a></li>
<li><a href="Neon-burning_process" title="Neon-burning process">Ne burning</a></li>
<li><a href="Oxygen-burning_process" title="Oxygen-burning process">O burning</a></li>
<li><a href="Silicon-burning_process" title="Silicon-burning process">Si burning</a></li>
<li><a href="S-process" title="S-process">s-process</a></li>
<li><a href="R-process" title="R-process">r-process</a></li>
<li><a href="P-process" title="P-process">p-process</a></li>
<li><a href="Nova" title="Nova">Nova</a>
<ul><li><a href="Symbiotic_nova" title="Symbiotic nova">Symbiotic</a></li>
<li><a href="Nova_remnant" title="Nova remnant">Remnant</a></li>
<li><a href="Luminous_red_nova" title="Luminous red nova">Luminous red nova</a></li>
<li><a href="Nova#Recurrent_novae" title="Nova">Recurrent</a></li>
<li><a href="Micronova" title="Micronova">Micronova</a></li></ul></li>
<li><a href="Supernova_nucleosynthesis" title="Supernova nucleosynthesis">Supernova</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_structure" title="Stellar structure">Structure</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Stellar_core" title="Stellar core">Core</a></li>
<li><a href="Convection_zone" title="Convection zone">Convection zone</a>
<ul><li><a href="Microturbulence" title="Microturbulence">Microturbulence</a></li>
<li><a href="Solar-like_oscillations" title="Solar-like oscillations">Oscillations</a></li></ul></li>
<li><a href="Radiation_zone" class="mw-redirect" title="Radiation zone">Radiation zone</a></li>
<li><a href="Stellar_atmosphere" title="Stellar atmosphere">Atmosphere</a>
<ul><li><a href="Photosphere" title="Photosphere">Photosphere</a></li>
<li><a href="Starspot" title="Starspot">Starspot</a></li>
<li><a href="Chromosphere" title="Chromosphere">Chromosphere</a></li>
<li><a href="Stellar_corona" title="Stellar corona">Stellar corona</a></li>
<li><a href="Alfv%C3%A9n_surface" title="Alfvén surface">Alfvén surface</a></li></ul></li>
<li><a href="Stellar_wind" title="Stellar wind">Stellar wind</a>
<ul><li><a href="Stellar-wind_bubble" title="Stellar-wind bubble">Bubble</a></li>
<li><a href="Bipolar_outflow" title="Bipolar outflow">Bipolar outflow</a></li></ul></li>
<li><a href="Accretion_disk" title="Accretion disk">Accretion disk</a>
<ul><li><a href="Protoplanetary_disk" title="Protoplanetary disk">Protoplanetary disk</a></li>
<li><a href="Proplyd" title="Proplyd">Proplyd</a></li></ul></li>
<li><a href="Asteroseismology" title="Asteroseismology">Asteroseismology</a>
<ul><li><a href="Helioseismology" title="Helioseismology">Helioseismology</a></li></ul></li>
<li><a href="Circumstellar_dust" title="Circumstellar dust">Circumstellar dust</a></li>
<li><a href="Cosmic_dust" title="Cosmic dust">Cosmic dust</a></li>
<li><a href="Circumstellar_envelope" title="Circumstellar envelope">Circumstellar envelope</a></li>
<li><a href="Eddington_luminosity" title="Eddington luminosity">Eddington luminosity</a></li>
<li><a href="Kelvin%E2%80%93Helmholtz_mechanism" title="Kelvin–Helmholtz mechanism">Kelvin–Helmholtz mechanism</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Properties</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Stellar_designations_and_names" title="Stellar designations and names">Designation</a></li>
<li><a href="Stellar_dynamics" title="Stellar dynamics">Dynamics</a></li>
<li><a href="Effective_temperature" title="Effective temperature">Effective temperature</a></li>
<li><a href="Luminosity" title="Luminosity">Luminosity</a></li>
<li><a href="Stellar_kinematics" title="Stellar kinematics">Kinematics</a></li>
<li><a href="Stellar_magnetic_field" title="Stellar magnetic field">Magnetic field</a></li>
<li><a href="Absolute_magnitude" title="Absolute magnitude">Absolute magnitude</a></li>
<li><a href="Stellar_mass" title="Stellar mass">Mass</a></li>
<li><a href="Metallicity" title="Metallicity">Metallicity</a></li>
<li><a href="Stellar_rotation" title="Stellar rotation">Rotation</a>
<ul><li><a href="Gravity_darkening" title="Gravity darkening">Gravity darkening</a></li></ul></li>
<li><a href="Starlight" title="Starlight">Starlight</a></li>
<li><a href="Variable_star" title="Variable star">Variable</a></li>
<li><a href="Photometric_system" title="Photometric system">Photometric system</a></li>
<li><a href="Color_index" title="Color index">Color index</a></li>
<li><a href="Hertzsprung%E2%80%93Russell_diagram" title="Hertzsprung–Russell diagram">Hertzsprung–Russell diagram</a></li>
<li><a href="Color%E2%80%93color_diagram" title="Color–color diagram">Color–color diagram</a></li>
<li><a href="Str%C3%B6mgren_sphere" title="Strömgren sphere">Strömgren sphere</a></li>
<li><a href="Kraft_break" title="Kraft break">Kraft break</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Star_system" title="Star system">Star systems</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Binary_star" title="Binary star">Binary</a>
<ul><li><a href="Contact_binary" title="Contact binary">Contact</a></li>
<li><a href="Common_envelope" title="Common envelope">Common envelope</a></li>
<li><a href="Eclipsing_binary" class="mw-redirect" title="Eclipsing binary">Eclipsing</a></li>
<li><a href="Symbiotic_binary" title="Symbiotic binary">Symbiotic</a></li></ul></li>
<li><a href="Star_system#Multiple_star_systems" title="Star system">Multiple</a></li>
<li><a href="Star_cluster" title="Star cluster">Cluster</a>
<ul><li><a href="Open_cluster" title="Open cluster">Open</a></li>
<li><a href="Globular_cluster" title="Globular cluster">Globular</a></li>
<li><a href="Super_star_cluster" title="Super star cluster">Super</a></li></ul></li>
<li><a href="Planetary_system" title="Planetary system">Planetary system</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Earth-centric<br>observations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Sun" title="Sun">Sun</a>
<ul><li><a href="Solar_eclipse" title="Solar eclipse">Solar eclipse</a></li>
<li><a href="Solar_radio_emission" title="Solar radio emission">Solar radio emission</a></li>
<li><a href="Sunlight" title="Sunlight">Sunlight</a></li></ul></li>
<li><a href="Pole_star" title="Pole star">Pole star</a></li>
<li><a href="Circumpolar_star" title="Circumpolar star">Circumpolar</a></li>
<li><a href="Constellation" title="Constellation">Constellation</a></li>
<li><a href="Asterism_(astronomy)" title="Asterism (astronomy)">Asterism</a></li>
<li><a href="Magnitude_(astronomy)" title="Magnitude (astronomy)">Magnitude</a>
<ul><li><a href="Apparent_magnitude" title="Apparent magnitude">Apparent</a></li>
<li><a href="Extinction_(astronomy)" title="Extinction (astronomy)">Extinction</a></li>
<li><a href="Photographic_magnitude" title="Photographic magnitude">Photographic</a></li></ul></li>
<li><a href="Radial_velocity" title="Radial velocity">Radial velocity</a></li>
<li><a href="Proper_motion" title="Proper motion">Proper motion</a></li>
<li><a href="Stellar_parallax" title="Stellar parallax">Parallax</a></li>
<li><a href="Photometric-standard_star" title="Photometric-standard star">Photometric-standard</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Lists_of_stars" title="Lists of stars">Lists</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="List_of_proper_names_of_stars" title="List of proper names of stars">Proper names</a>
<ul><li><a href="List_of_Arabic_star_names" title="List of Arabic star names">Arabic</a></li>
<li><a href="Chinese_star_names" class="mw-redirect" title="Chinese star names">Chinese</a></li></ul></li>
<li><a href="List_of_star_extremes" title="List of star extremes">Extremes</a>
<ul><li><a href="List_of_most_massive_stars" title="List of most massive stars">Most massive</a></li>
<li><a href="List_of_hottest_stars" title="List of hottest stars">Highest temperature</a></li>
<li><a href="List_of_coolest_stars" title="List of coolest stars">Lowest temperature</a></li>
<li><a href="List_of_largest_stars" title="List of largest stars">Largest volume</a></li>
<li><a href="List_of_smallest_known_stars" title="List of smallest known stars">Smallest volume</a></li>
<li><a href="List_of_brightest_stars" title="List of brightest stars">Brightest</a></li>
<li><a href="Historical_brightest_stars" title="Historical brightest stars">Historical brightest</a></li>
<li><a href="List_of_most_luminous_stars" title="List of most luminous stars">Most luminous</a></li>
<li><a href="List_of_nearest_stars" title="List of nearest stars">Nearest</a>
<ul><li><a href="List_of_nearest_bright_stars" title="List of nearest bright stars">bright</a></li></ul></li></ul></li>
<li><a href="List_of_most_distant_stars" title="List of most distant stars">Most distant</a></li>
<li><a href="List_of_stars_with_resolved_images" title="List of stars with resolved images">With resolved images</a></li>
<li><a href="List_of_multiplanetary_systems" title="List of multiplanetary systems">With multiple exoplanets</a></li>
<li><a href="List_of_brown_dwarfs" title="List of brown dwarfs">Brown dwarfs</a></li>
<li><a href="List_of_red_dwarfs" title="List of red dwarfs">Red dwarfs</a></li>
<li><a href="List_of_white_dwarfs" title="List of white dwarfs">White dwarfs</a></li>
<li><a href="List_of_novae_in_the_Milky_Way_galaxy" title="List of novae in the Milky Way galaxy">Milky Way novae</a></li>
<li><a href="List_of_supernovae" title="List of supernovae">Supernovae</a>
<ul><li><a href="List_of_supernova_candidates" title="List of supernova candidates">Candidates</a></li>
<li><a href="List_of_supernova_remnants" title="List of supernova remnants">Remnants</a></li></ul></li>
<li><a href="List_of_planetary_nebulae" title="List of planetary nebulae">Planetary nebulae</a></li>
<li><a href="Timeline_of_stellar_astronomy" title="Timeline of stellar astronomy">Timeline of stellar astronomy</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Substellar_object" title="Substellar object">Substellar object</a>
<ul><li><a href="Brown_dwarf" title="Brown dwarf">Brown dwarf</a>
<ul><li><a href="Brown-dwarf_desert" title="Brown-dwarf desert">Desert</a></li>
<li><a href="Sub-brown_dwarf" title="Sub-brown dwarf">Sub</a></li></ul></li>
<li><a href="Planet" title="Planet">Planet</a></li></ul></li>
<li><a href="Galactic_year" title="Galactic year">Galactic year</a></li>
<li><a href="Galaxy" title="Galaxy">Galaxy</a></li>
<li><a href="Guest_star_(astronomy)" title="Guest star (astronomy)">Guest</a></li>
<li><a href="Gravity" title="Gravity">Gravity</a></li>
<li><a href="Intergalactic_star" title="Intergalactic star">Intergalactic</a></li>
<li><a href="Neutron_star_merger" title="Neutron star merger">Neutron star merger</a></li>
<li><a href="Planet-hosting_stars" class="mw-redirect" title="Planet-hosting stars">Planet-hosting stars</a></li>
<li><a href="Stellar_collision" title="Stellar collision">Stellar collision</a></li>
<li><a href="Stellar_engulfment" title="Stellar engulfment">Stellar engulfment</a></li>
<li><a href="Tidal_disruption_event" title="Tidal disruption event">Tidal disruption event</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</li>
<li><span class="nowrap"><span class="noviewer" typeof="mw:File"></span> </span><a href="Portal%3AStars" title="Portal:Stars">Stars portal</a></li></ul>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Solar_System_models62" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><div id="Solar_System_models62" style="font-size:114%;margin:0 4em"><a href="Solar_System_model" title="Solar System model">Solar System models</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Devices</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Antikythera_mechanism" title="Antikythera mechanism">Antikythera mechanism</a></li>
<li><a href="Armillary_sphere" title="Armillary sphere">Armillary sphere</a></li>
<li><a href="Astrarium" title="Astrarium">Astrarium</a></li>
<li><a href="Astronomical_clock" title="Astronomical clock">Astronomical clock</a></li>
<li><a href="Orrery" title="Orrery">Orrery</a>
<ul><li><a href="Eise_Eisinga_Planetarium" title="Eise Eisinga Planetarium">Eise Eisinga Planetarium</a></li></ul></li>
<li><a href="Tellurion" title="Tellurion">Tellurion</a></li></ul>
</div></td><td class="noviewer navbox-image" rowspan="3" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Models</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Akaa_Solar_System_Scale_Model" title="Akaa Solar System Scale Model">Akaa Solar System Scale Model</a> (Akaa, Finland)</li>
<li><a href="Gravity_Discovery_Centre" title="Gravity Discovery Centre">Gravity Discovery Centre</a> (Gingin, Australia)</li>
<li><a href="Kystagerparken" title="Kystagerparken">Kystagerparken</a> (Hvidovre, Denmark)</li>
<li><a href="Monument_to_the_Sun" title="Monument to the Sun">Monument to the Sun</a> (Zadar, Croatia)</li>
<li><a href="Nine_Views" title="Nine Views">Nine Views</a> (Zagreb, Croatia)</li>
<li><a href="Pajam%C3%A4ki_Solar_System_Scale_Model" title="Pajamäki Solar System Scale Model">Pajamäki Solar System Scale Model</a> (Helsinki and Espoo, Finland)</li>
<li><a href="Planet_Lofoten" title="Planet Lofoten">Planet Lofoten</a> (Lofoten, Norway)</li>
<li><a href="Sagan_Planet_Walk" title="Sagan Planet Walk">Sagan Planet Walk</a> (Ithaca, New York)</li>
<li><a href="Somerset_Space_Walk" title="Somerset Space Walk">Somerset Space Walk</a> (Somerset, England)</li>
<li><a href="Sweden_Solar_System" title="Sweden Solar System">Sweden Solar System</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul>
<li><a href="Kirkhill_Astronomical_Pillar" title="Kirkhill Astronomical Pillar">Kirkhill Astronomical Pillar</a></li>
<li><a href="Historical_models_of_the_Solar_System" title="Historical models of the Solar System">Historical models of the Solar System</a></li>
<li><a href="Numerical_model_of_the_Solar_System" title="Numerical model of the Solar System">Numerical model of the Solar System</a></li></ul>
</div></td></tr></tbody></table></div>
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</style></div><div role="navigation" class="navbox authority-control" aria-labelledby="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q544#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata2116" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q544#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata2116" style="font-size:114%;margin:0 4em">Authority control databases </div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">International</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://id.worldcat.org/fast/1244288">FAST</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">National</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Sonnensystem"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/1236963989">Germany</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Solar system"><a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/sh85124544">United States</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Système solaire"><a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb119377185">France</a></span></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Système solaire"><a rel="nofollow" class="external text" href="https://data.bnf.fr/ark:/12148/cb119377185">BnF data</a></span></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://id.ndl.go.jp/auth/ndlna/00572587">Japan</a></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="sluneční soustava"><a rel="nofollow" class="external text" href="https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=ph125704&CON_LNG=ENG">Czech Republic</a></span></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://datos.bne.es/resource/XX456635">Spain</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://www.nli.org.il/en/authorities/987007555793205171">Israel</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://catalog.archives.gov/id/10642820">NARA</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://lux.collections.yale.edu/view/concept/0aa0ff25-0d64-43e3-aaa4-ec4db7fce287">Yale LUX</a></span></li></ul></div></td></tr></tbody></table></div>
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