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<span>History</span> </div> </a> <button aria-controls="toc-History-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle History subsection</span> </button> <ul id="toc-History-sublist" class="vector-toc-list"> <li id="toc-Original_Oort_cloud_model" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Original_Oort_cloud_model"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Original Oort cloud model</span> </div> </a> <ul id="toc-Original_Oort_cloud_model-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-New_model" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#New_model"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>New model</span> </div> </a> <ul id="toc-New_model-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Characteristics" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Characteristics"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Characteristics</span> </div> </a> <button aria-controls="toc-Characteristics-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Characteristics subsection</span> </button> <ul id="toc-Characteristics-sublist" class="vector-toc-list"> <li id="toc-Structure_and_composition" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Structure_and_composition"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Structure and composition</span> </div> </a> <ul id="toc-Structure_and_composition-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Formation" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Formation"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Formation</span> </div> </a> <ul id="toc-Formation-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Possible_Hills_cloud_objects" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Possible_Hills_cloud_objects"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Possible Hills cloud objects</span> </div> </a> <button aria-controls="toc-Possible_Hills_cloud_objects-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Possible Hills cloud objects subsection</span> </button> <ul id="toc-Possible_Hills_cloud_objects-sublist" class="vector-toc-list"> <li id="toc-Comets" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Comets"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Comets</span> </div> </a> <ul id="toc-Comets-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sedna" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sedna"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2</span> <span>Sedna</span> </div> </a> <ul id="toc-Sedna-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-2012_VP113" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#2012_VP113"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.3</span> <span><span>2012 VP<sub>113</sub></span></span> </div> </a> <ul id="toc-2012_VP113-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Footnotes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Footnotes"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Footnotes</span> </div> </a> <ul id="toc-Footnotes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Further reading</span> </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Table of Contents" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet 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Available in 24 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-24" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">24 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Hillswolk" title="Hillswolk – Afrikaans" lang="af" hreflang="af" data-title="Hillswolk" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B3%D8%AD%D8%A7%D8%A8%D8%A9_%D9%87%D9%8A%D9%84%D8%B2" title="سحابة هيلز – Arabic" lang="ar" hreflang="ar" data-title="سحابة هيلز" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%92%D0%BE%D0%B1%D0%BB%D0%B0%D0%BA%D0%B0_%D0%A5%D1%96%D0%BB%D1%81%D0%B0" title="Воблака Хілса – Belarusian" lang="be" hreflang="be" data-title="Воблака Хілса" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/N%C3%BAvol_de_Hills" title="Núvol de Hills – Catalan" lang="ca" hreflang="ca" data-title="Núvol de Hills" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Hills%C5%AFv_oblak" title="Hillsův oblak – Czech" lang="cs" hreflang="cs" data-title="Hillsův oblak" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Hills-Wolke" title="Hills-Wolke – German" lang="de" hreflang="de" data-title="Hills-Wolke" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Nube_de_Hills" title="Nube de Hills – Spanish" lang="es" hreflang="es" data-title="Nube de Hills" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Hillsen_hodeia" title="Hillsen hodeia – Basque" lang="eu" hreflang="eu" data-title="Hillsen hodeia" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D8%A8%D8%B1_%D9%87%DB%8C%D9%84" title="ابر هیل – Persian" lang="fa" hreflang="fa" data-title="ابر هیل" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Nuage_de_Hills" title="Nuage de Hills – French" lang="fr" hreflang="fr" data-title="Nuage de Hills" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%9E%90%EC%8A%A4_%EA%B5%AC%EB%A6%84" title="힐스 구름 – Korean" lang="ko" hreflang="ko" data-title="힐스 구름" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Awan_Hills" title="Awan Hills – Indonesian" lang="id" hreflang="id" data-title="Awan Hills" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Nubes_Hills" title="Nubes Hills – Latin" lang="la" hreflang="la" data-title="Nubes Hills" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A5%D0%B8%D0%BB%D1%81%D0%BE%D0%B2_%D0%9E%D0%B1%D0%BB%D0%B0%D0%BA" title="Хилсов Облак – Macedonian" lang="mk" hreflang="mk" data-title="Хилсов Облак" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%86%85%E9%83%A8%E3%82%AA%E3%83%BC%E3%83%AB%E3%83%88%E9%9B%B2" title="内部オールト雲 – Japanese" lang="ja" hreflang="ja" data-title="内部オールト雲" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Nuvem_de_Hills" title="Nuvem de Hills – Portuguese" lang="pt" hreflang="pt" data-title="Nuvem de Hills" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Norul_lui_Hills" title="Norul lui Hills – Romanian" lang="ro" hreflang="ro" data-title="Norul lui Hills" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Hillsov_mrak_kom%C3%A9t" title="Hillsov mrak komét – Slovak" lang="sk" hreflang="sk" data-title="Hillsov mrak komét" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Hillsin_pilvi" title="Hillsin pilvi – Finnish" lang="fi" hreflang="fi" data-title="Hillsin pilvi" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%A1%E0%B8%86%E0%B8%AE%E0%B8%B4%E0%B8%A5%E0%B8%AA%E0%B9%8C" title="เมฆฮิลส์ – Thai" lang="th" hreflang="th" data-title="เมฆฮิลส์" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A5%D0%BC%D0%B0%D1%80%D0%B0_%D0%93%D1%96%D0%BB%D0%BB%D1%81%D0%B0" title="Хмара Гіллса – Ukrainian" lang="uk" hreflang="uk" data-title="Хмара Гіллса" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/%C4%90%C3%A1m_m%C3%A2y_Hills" title="Đám mây Hills – Vietnamese" lang="vi" hreflang="vi" data-title="Đám mây Hills" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%86%85%E5%A5%A5%E5%B0%94%E7%89%B9%E4%BA%91" title="内奥尔特云 – Wu" lang="wuu" hreflang="wuu" data-title="内奥尔特云" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%86%85%E5%A5%A5%E5%B0%94%E7%89%B9%E4%BA%91" title="内奥尔特云 – Chinese" lang="zh" hreflang="zh" data-title="内奥尔特云" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet 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dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Vast, theoretical circumstellar disc</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For the gravitational sphere of <a href="/wiki/Astronomical_bodies" class="mw-redirect" title="Astronomical bodies">astronomical bodies</a>, see <a href="/wiki/Hill_sphere" title="Hill sphere">Hill sphere</a>.</div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Kuiper_oort.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Kuiper_oort.jpg/300px-Kuiper_oort.jpg" decoding="async" width="300" height="257" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Kuiper_oort.jpg/450px-Kuiper_oort.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/0/03/Kuiper_oort.jpg 2x" data-file-width="500" data-file-height="429" /></a><figcaption>Artist's view of the theoretical Oort cloud, Hills cloud, and Kuiper belt (inset)</figcaption></figure> <p>In <a href="/wiki/Astronomy" title="Astronomy">astronomy</a>, the <b>Hills cloud</b> (also called the <b>inner Oort cloud</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and <b>inner cloud</b><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>) is a theoretical vast <a href="/wiki/Circumstellar_disc" title="Circumstellar disc">circumstellar disc</a>, interior to the <a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a>, whose outer border would be located at around 20,000 to 30,000 <a href="/wiki/Astronomical_unit" title="Astronomical unit">astronomical units</a> (AU) from the <a href="/wiki/Sun" title="Sun">Sun</a>, and whose inner border, less well defined, is hypothetically located at <span class="nowrap"><span data-sort-value="7013373994676750000♠"></span>250–1500 AU</span>,<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (January 2009)">citation needed</span></a></i>]</sup> well beyond planetary and <a href="/wiki/Kuiper_Belt" class="mw-redirect" title="Kuiper Belt">Kuiper Belt</a> object orbits—but distances might be much greater. If it exists, the Hills cloud likely contains roughly 5 times as many <a href="/wiki/Comet" title="Comet">comets</a> as the Oort cloud.<sup id="cite_ref-SOA_3-0" class="reference"><a href="#cite_note-SOA-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Overview">Overview</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=1" title="Edit section: Overview"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The need for the Hills cloud hypothesis is intimately connected with the dynamics of the Oort cloud: Oort cloud comets are continually perturbed in their environment. A non-negligible fraction leave the <a href="/wiki/Solar_System" title="Solar System">Solar System</a>, or tumble into the inner system where they evaporate, fall into the Sun, or collide with or are ejected by the <a href="/wiki/Giant_planet" title="Giant planet">giant planets</a>. Hence, the Oort cloud should have been depleted long ago, but it is still well supplied with comets. </p><p>The Hills cloud hypothesis addresses the persistence of the Oort cloud by postulating a densely populated, inner-Oort region—the "Hills cloud". Objects ejected from the Hills cloud are likely to end up in the classical Oort cloud region, maintaining the Oort cloud.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> It is likely that the Hills cloud has the largest concentration of comets in the whole Solar System. </p><p>The existence of the Hills cloud is plausible, since many bodies have been found there already. It should be denser than the Oort cloud.<sup id="cite_ref-hills1981_5-0" class="reference"><a href="#cite_note-hills1981-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Gravitational interaction with the closest stars and tidal effects from the galaxy have given circular orbits to the comets in the Oort cloud, which may not be the case for the comets in the Hills cloud. The Hills cloud's total mass is unknown; some scientists think it would be many times more massive than the outer Oort cloud. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=2" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Original_Oort_cloud_model">Original Oort cloud model</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=3" title="Edit section: Original Oort cloud model"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:ErnstJuliusOpik.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/85/ErnstJuliusOpik.jpg/150px-ErnstJuliusOpik.jpg" decoding="async" width="150" height="227" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/8/85/ErnstJuliusOpik.jpg 1.5x" data-file-width="205" data-file-height="310" /></a><figcaption>Ernst Öpik</figcaption></figure> <p>Between 1932 and 1981, astronomers believed that the <a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a> proposed by <a href="/wiki/Ernst_%C3%96pik" title="Ernst Öpik">Ernst Öpik</a> and <a href="/wiki/Jan_Oort" title="Jan Oort">Jan Oort</a>, and the <a href="/wiki/Kuiper_belt" title="Kuiper belt">Kuiper belt</a> were the only reserves of comets in the Solar System. </p><p>In 1932, Estonian astronomer Ernst Öpik hypothesized that comets were rooted in a cloud orbiting the outer boundary of the Solar System.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> In 1950, this idea was revived independently by Dutch astronomer Jan Oort to explain an apparent contradiction: Comets are destroyed after several passes through the inner Solar System, so if any had existed for several billion years (since the beginning of the Solar System), no more could be observed now.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>Oort selected 46 comets for his study that were best observed between 1850 and 1952. The distribution of the <a href="/wiki/Reciprocal_(mathematics)" class="mw-redirect" title="Reciprocal (mathematics)">reciprocal</a> of the <a href="/wiki/Semi-major_axis" class="mw-redirect" title="Semi-major axis">semi-major axes</a> showed a maximum frequency which suggested the existence of a <a href="/wiki/Oort_cloud" title="Oort cloud">reservoir of comets</a> between 40,000 and 150,000 AU (0.6 and 2.4 ly) away. This reservoir, located at the limits of the Sun's <a href="/wiki/Sphere_of_influence_(astrodynamics)" title="Sphere of influence (astrodynamics)">sphere of influence (astrodynamics)</a>, would be subject to stellar disturbances, likely to expel cloud comets outwards or impel them inwards. </p> <div class="mw-heading mw-heading2"><h2 id="New_model">New model</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=4" title="Edit section: New model"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Hills.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/3/3a/Hills.gif" decoding="async" width="100" height="100" class="mw-file-element" data-file-width="100" data-file-height="100" /></a><figcaption><a href="/wiki/Jack_G._Hills" title="Jack G. Hills">Jack G. Hills</a>, the astronomer who first proposed the Hills cloud</figcaption></figure> <p>In the 1980s, astronomers realized that the main cloud could have an internal section that would start at about 3,000 <a href="/wiki/Astronomical_unit" title="Astronomical unit">AU</a> from the Sun and continue up to the classic cloud at 20,000 AU. Most estimates place the population of the Hills cloud at about 20 trillion (about five to ten times that of the outer cloud), although the number could be ten times greater than that.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>The main model of an "inner cloud" was proposed in 1981 by the astronomer <a href="/wiki/Jack_G._Hills" title="Jack G. Hills">Jack G. Hills</a>, from the Los Alamos Laboratory, who gave the region its name. He calculated that the passage of a star near the Solar System could have triggered a "comet rain," thereby causing extinctions on Earth. </p><p>His research suggested that the orbits of most cloud comets have a semi-major axis of 10,000 AU, much closer to the Sun than the proposed distance of the Oort cloud.<sup id="cite_ref-hills1981_5-1" class="reference"><a href="#cite_note-hills1981-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Moreover, the influence of the surrounding stars and that of the <a href="/wiki/Galactic_tide" title="Galactic tide">galactic tide</a> should have sent the Oort cloud comets either closer to the Sun or outside of the Solar System. To account for these issues, Hills proposed the presence of an inner cloud, which would have tens or hundreds of times as many comet nuclei as the outer halo.<sup id="cite_ref-hills1981_5-2" class="reference"><a href="#cite_note-hills1981-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Thus, it would be a possible source of new comets to resupply the tenuous outer cloud. </p><p>In the following years other astronomers searched for the Hills cloud and studied <a href="/wiki/Long-period_comet" class="mw-redirect" title="Long-period comet">long-period comets</a>. This was the case with <a href="/wiki/Sidney_van_den_Bergh" title="Sidney van den Bergh">Sidney van den Bergh</a> and Mark E. Bailey, who each suggested the Hills cloud's structure in 1982 and 1983, respectively.<sup id="cite_ref-Inner_oort_cloud2_10-0" class="reference"><a href="#cite_note-Inner_oort_cloud2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> In 1986, Bailey stated that the majority of comets in the Solar System were located not in the Oort cloud area, but closer and in an internal cloud, with an orbit with a semi-major axis of 5,000 AU.<sup id="cite_ref-Inner_oort_cloud2_10-1" class="reference"><a href="#cite_note-Inner_oort_cloud2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The research was further expanded upon by studies of Victor Clube and Bill Napier (1987), and by R. B. Stothers (1988).<sup id="cite_ref-Inner_oort_cloud2_10-2" class="reference"><a href="#cite_note-Inner_oort_cloud2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>However, the Hills cloud gained major interest in 1991,<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> when scientists resumed Hills' theory.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Characteristics">Characteristics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=5" title="Edit section: Characteristics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Structure_and_composition">Structure and composition</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=6" title="Edit section: Structure and composition"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Oort_cloud_lrg.en.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Oort_cloud_lrg.en.png/220px-Oort_cloud_lrg.en.png" decoding="async" width="220" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Oort_cloud_lrg.en.png/330px-Oort_cloud_lrg.en.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/53/Oort_cloud_lrg.en.png/440px-Oort_cloud_lrg.en.png 2x" data-file-width="800" data-file-height="817" /></a><figcaption>Interior and exterior Oort cloud</figcaption></figure> <p>Oort cloud comets are constantly disturbed by their surroundings and distant objects. A significant number either leave the Solar System or go much closer to the Sun. The Oort cloud should therefore have broken apart long ago, but it still remains intact. The Hills cloud proposal could provide an explanation; J. G. Hills and other scientists suggest that it could replenish the comets in the outer Oort cloud.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>It is also likely that the Hills cloud is the largest concentration of comets across the Solar System.<sup id="cite_ref-Inner_oort_cloud2_10-3" class="reference"><a href="#cite_note-Inner_oort_cloud2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The Hills cloud should be much denser than the outer Oort cloud: If it exists, it is somewhere between 5,000 and 20,000 AU in size. In contrast, the Oort cloud is between 20,000 and 50,000 AU (0.3 and 0.8 ly) in size.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p><p>The mass of the Hills cloud is not known. Some scientists believe it could be five times more massive than the Oort cloud.<sup id="cite_ref-SOA_3-1" class="reference"><a href="#cite_note-SOA-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Mark E. Bailey estimates the mass of the Hills cloud to be 13.8 <a href="/wiki/Earth_mass" title="Earth mass">Earth masses</a>, if the majority of the bodies are located at 10,000 AU.<sup id="cite_ref-Inner_oort_cloud2_10-4" class="reference"><a href="#cite_note-Inner_oort_cloud2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>If the analyses of comets are representative of the whole, the vast majority of Hills cloud objects consists of various ices, such as water, methane, ethane, carbon monoxide and hydrogen cyanide.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> However, the discovery of the object <a href="/wiki/1996_PW" title="1996 PW">1996 PW</a>, an asteroid on a typical orbit of a long-period comet, suggests that the cloud may also contain rocky objects.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p><p>The carbon analysis and isotopic ratios of nitrogen firstly in the comets of the families of the Oort cloud and the other in the body of the Jupiter area shows little difference between the two, despite their distinctly remote areas. This suggests that both come from a <a href="/wiki/Protoplanetary_disk" title="Protoplanetary disk">protoplanetary disk</a>,<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> a conclusion also supported by studies of comet cloud sizes and the recent impact study of comet <a href="/wiki/Tempel_1" title="Tempel 1">Tempel 1</a>.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <div class="thumb tnone" style="margin-left:auto;margin-right:auto;overflow:hidden;width:auto;max-width:2810px"><div class="thumbinner"><div class="noresize thumbimage" style="overflow:auto"><span typeof="mw:File"><a href="/wiki/File:Objects_between_sun_and_alpha_centauri.jpg" class="mw-file-description" title="Schematic view to scale of known astronomical objects within 4.5 light years of the Sun. The Hills cloud is shown here as an aqua green line (cross-section of its torus shape)."><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Objects_between_sun_and_alpha_centauri.jpg/2800px-Objects_between_sun_and_alpha_centauri.jpg" decoding="async" width="2800" height="280" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Objects_between_sun_and_alpha_centauri.jpg/4200px-Objects_between_sun_and_alpha_centauri.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Objects_between_sun_and_alpha_centauri.jpg/5600px-Objects_between_sun_and_alpha_centauri.jpg 2x" data-file-width="10800" data-file-height="1080" /></a></span></div><div class="thumbcaption"><div class="magnify"><a href="/wiki/File:Objects_between_sun_and_alpha_centauri.jpg" title="File:Objects between sun and alpha centauri.jpg"> </a></div>Schematic view to scale of known <a href="/wiki/Astronomical_objects" class="mw-redirect" title="Astronomical objects">astronomical objects</a> within 4.5 light years of the Sun. The Hills cloud is shown here as an aqua green line (cross-section of its torus shape).</div></div></div> <div class="mw-heading mw-heading3"><h3 id="Formation">Formation</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=7" title="Edit section: Formation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Many scientists think that the Hills cloud formed from a close (800 AU) encounter between the <a href="/wiki/Sun" title="Sun">Sun</a> and another star within the first 800 million years of the <a href="/wiki/Solar_System" title="Solar System">Solar System</a>, which could explain the eccentric orbit of <a href="/wiki/90377_Sedna" class="mw-redirect" title="90377 Sedna">90377 Sedna</a>, which should not be where it is, being neither influenced by <a href="/wiki/Jupiter" title="Jupiter">Jupiter</a> nor <a href="/wiki/Neptune" title="Neptune">Neptune</a>, nor tidal effects.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> It is then possible that the Hills cloud would be "younger" than the <a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a>. However, only Sedna and two other <a href="/wiki/Sednoid" title="Sednoid">sednoids</a> (<a href="/wiki/2012_VP113" title="2012 VP113"><span class="nowrap">2012 VP<sub>113</sub></span></a> and <a href="/wiki/541132_Lele%C4%81k%C5%ABhonua" title="541132 Leleākūhonua">541132 Leleākūhonua</a>) bear those irregularities; for <a href="/wiki/(87269)_2000_OO67" title="(87269) 2000 OO67"><span class="nowrap">2000 OO<sub>67</sub></span></a> and <a href="/wiki/(308933)_2006_SQ372" title="(308933) 2006 SQ372"><span class="nowrap">2006 SQ<sub>372</sub></span></a> this theory is not necessary, because both orbit close to the Solar System's <a href="/wiki/Gas_giant" title="Gas giant">gas giants</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Possible_Hills_cloud_objects">Possible Hills cloud objects</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=8" title="Edit section: Possible Hills cloud objects"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Update plainlinks metadata ambox ambox-content ambox-Update" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Ambox_current_red_Americas.svg/42px-Ambox_current_red_Americas.svg.png" decoding="async" width="42" height="34" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/53/Ambox_current_red_Americas.svg/63px-Ambox_current_red_Americas.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/53/Ambox_current_red_Americas.svg/84px-Ambox_current_red_Americas.svg.png 2x" data-file-width="360" data-file-height="290" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section needs to be <b>updated</b>.<span class="hide-when-compact"> Please help update this article to reflect recent events or newly available information.</span> <span class="date-container"><i>(<span class="date">November 2019</span>)</i></span></div></td></tr></tbody></table> <table class="wikitable" style="float: right; margin-right: 0; margin-left: 1em; text-align: center;"> <tbody><tr> <th>Name</th> <th>Diameter<br />(km)</th> <th><a href="/wiki/Perihelion" class="mw-redirect" title="Perihelion">Perihelion</a><br />(AU)</th> <th><a href="/wiki/Aphelion" class="mw-redirect" title="Aphelion">Aphelion</a><br />(AU)</th> <th>Discovery </th></tr> <tr> <td align="left"><a href="/wiki/2012_VP113" title="2012 VP113"><span class="nowrap">2012 VP<sub>113</sub></span></a></td> <td>315 to 640</td> <td>80.5</td> <td>445</td> <td>2012 </td></tr> <tr> <td align="left"><a href="/wiki/(90377)_Sedna" class="mw-redirect" title="(90377) Sedna">(90377) Sedna</a></td> <td>995 to 1,060</td> <td>76.1</td> <td>935</td> <td>2003 </td></tr> <tr> <td align="left"><a href="/wiki/(87269)_2000_OO67" title="(87269) 2000 OO67"><span class="nowrap">(87269) 2000 OO<sub>67</sub></span></a></td> <td>28 to 87</td> <td>20.8</td> <td>1,014.2</td> <td>2000 </td></tr> <tr> <td align="left"><a href="/wiki/(308933)_2006_SQ372" title="(308933) 2006 SQ372"><span class="nowrap">(308933) 2006 SQ<sub>372</sub></span></a></td> <td>50 to 100</td> <td>24.17</td> <td>2,005.38</td> <td>2006 </td></tr> <tr> <td align="left"><a href="/wiki/(541132)_Lele%C4%81k%C5%ABhonua" class="mw-redirect" title="(541132) Leleākūhonua">(541132) Leleākūhonua</a></td> <td>200 to 248</td> <td>64.94</td> <td>2123</td> <td>2015 </td></tr></tbody></table> <p>Bodies in the Hills cloud are made mostly of water ice, methane and ammonia. Astronomers suspect many long-period comets originate from the Hills cloud, such as <a href="/wiki/Comet_Hyakutake" title="Comet Hyakutake">Comet Hyakutake</a>. </p><p>In their article announcing the discovery of Sedna, Mike Brown and his colleagues asserted that they observed the first Oort cloud object. They observed that, unlike scattered disc objects like Eris, Sedna's perihelion (76 AU) was too remote for the gravitational influence of Neptune to have played a role in its evolution.<sup id="cite_ref-Mike_20-0" class="reference"><a href="#cite_note-Mike-20"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> The authors regarded Sedna as an "inner Oort cloud object", located along the <a href="/wiki/Ecliptic" title="Ecliptic">Ecliptic</a> and placed between the Kuiper belt and the more spherical part of the Oort cloud.<sup id="cite_ref-Swiss_21-0" class="reference"><a href="#cite_note-Swiss-21"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-LykDyn_22-0" class="reference"><a href="#cite_note-LykDyn-22"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> However, Sedna is much closer to the Sun than expected for objects in the Hills cloud and its inclination is close to that of the planets and the Kuiper belt. </p><p>Considerable mystery surrounds <span class="nowrap"><a href="/wiki/2008_KV42" class="mw-redirect" title="2008 KV42">2008 KV<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">42</span></span></a></span>, with its retrograde orbit that could make it originate from the Hills cloud or perhaps the Oort cloud.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> The same goes for <a href="/wiki/Damocloid" title="Damocloid">damocloids</a>, whose origins are doubtful, such as the namesake for this category, <a href="/wiki/5335_Damocles" title="5335 Damocles">5335 Damocles</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Comets">Comets</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=9" title="Edit section: Comets"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Comet_P1_McNaught02_-_23-01-07.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Comet_P1_McNaught02_-_23-01-07.jpg/220px-Comet_P1_McNaught02_-_23-01-07.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Comet_P1_McNaught02_-_23-01-07.jpg/330px-Comet_P1_McNaught02_-_23-01-07.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Comet_P1_McNaught02_-_23-01-07.jpg/440px-Comet_P1_McNaught02_-_23-01-07.jpg 2x" data-file-width="1600" data-file-height="1067" /></a><figcaption>Comet McNaught</figcaption></figure> <p>Astronomers suspect that several comets come from the same region as the Hills cloud; in particular, they focus on those with aphelia greater than 1,000 AU (which are thus from a farther region than the Kuiper belt), but less than 10,000 AU (or they would otherwise be too close to the outer Oort cloud). </p><p>Some famous comets reach great distances and are candidates for Hills cloud objects. For example, <a href="/wiki/C/2007_E2_(Lovejoy)" title="C/2007 E2 (Lovejoy)">Comet Lovejoy</a>, discovered on 15 March 2007 by Australian astronomer <a href="/wiki/Terry_Lovejoy" title="Terry Lovejoy">Terry Lovejoy</a>, had an inbound aphelion distance of around 1,800 AU. Comet Hyakutake, discovered in 1996 by amateur astronomer <a href="/wiki/Yuji_Hyakutake" title="Yuji Hyakutake">Yuji Hyakutake</a>, has an outbound aphelion of 3,500 AU. <a href="/wiki/C/2006_P1" class="mw-redirect" title="C/2006 P1">Comet McNaught</a>, discovered on 7 August 2006 in Australia by <a href="/wiki/Robert_H._McNaught" title="Robert H. McNaught">Robert H. McNaught</a>, became one of the brightest comets of recent decades, with an aphelion of 4,100 AU. <a href="/wiki/Comet_Machholz" title="Comet Machholz">Comet Machholz</a>, discovered on 27 August 2004 by amateur astronomer <a href="/wiki/Donald_Machholz" title="Donald Machholz">Donald Machholz</a>, came from about 5,000 AU. </p> <div class="mw-heading mw-heading3"><h3 id="Sedna">Sedna</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=10" title="Edit section: Sedna"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Planetoid_90377_sedna_animation_location.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/2/21/Planetoid_90377_sedna_animation_location.gif" decoding="async" width="320" height="240" class="mw-file-element" data-file-width="320" data-file-height="240" /></a><figcaption>Animation of Sedna's orbit (in red) with the Hills cloud (in blue) at the last moment of the loop</figcaption></figure> <p><a href="/wiki/90377_Sedna" class="mw-redirect" title="90377 Sedna">Sedna</a> is a <a href="/wiki/Dwarf_planet" title="Dwarf planet">dwarf planet</a> discovered by <a href="/wiki/Michael_E._Brown" title="Michael E. Brown">Michael E. Brown</a>, <a href="/wiki/Chad_Trujillo" title="Chad Trujillo">Chad Trujillo</a> and <a href="/wiki/David_L._Rabinowitz" title="David L. Rabinowitz">David L. Rabinowitz</a> on 14 November 2003. <a href="/wiki/Spectroscopy" title="Spectroscopy">Spectroscopic</a> measures show that its surface composition is similar to that of other <a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">trans-Neptunian objects</a>: It is mainly composed of a mixture of water ices, <a href="/wiki/Methane" title="Methane">methane</a>, and <a href="/wiki/Nitrogen" title="Nitrogen">nitrogen</a> with <a href="/wiki/Tholin" title="Tholin">tholins</a>. Its surface is one of the reddest in the Solar System. </p><p>This may be the first detection of an object originating from the Hills cloud, depending on the definition used. The area of the Hills cloud is defined as any objects with orbits measuring between 1,500 and 10,000 AU.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (February 2016)">citation needed</span></a></i>]</sup> </p> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Artist%27s_conception_of_Sedna.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/68/Artist%27s_conception_of_Sedna.jpg/200px-Artist%27s_conception_of_Sedna.jpg" decoding="async" width="200" height="150" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/68/Artist%27s_conception_of_Sedna.jpg/300px-Artist%27s_conception_of_Sedna.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/68/Artist%27s_conception_of_Sedna.jpg/400px-Artist%27s_conception_of_Sedna.jpg 2x" data-file-width="3000" data-file-height="2250" /></a><figcaption>Artist's impression of Sedna</figcaption></figure> <p>Sedna is, however, much closer than the supposed distance of the Hills cloud. The planetoid discovered at a distance of about 13 billion kilometres (87 AU) from the Sun, travels in an elliptical orbit of 11,400 years with a perihelion point of only 76 AU from the Sun during its closest approach (the next to occur in 2076), and travels out to 936 AU at its farthest point. </p><p>However, Sedna is not considered a Kuiper belt object, because its orbit does not bring it into the region of the Kuiper belt at 50 AU. Sedna is a "<a href="/wiki/Detached_object" title="Detached object">detached object</a>", and thus is not in a resonance with Neptune. </p> <div style="clear:left;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="2012_VP113"><span class="nowrap">2012 VP<sub>113</sub></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=11" title="Edit section: 2012 VP113"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">Trans-Neptunian object</a> <span class="nowrap"><a href="/wiki/2012_VP113" title="2012 VP113">2012 VP<span style="position: relative; top: 0.3em;"><span style="font-size:80%;">113</span></span></a></span> was announced on 26 March 2014 and has a similar orbit to Sedna with a perihelion point significantly detached from Neptune. Its orbit lies between 80 and 400 AU from the Sun. </p> <div class="mw-heading mw-heading2"><h2 id="Footnotes">Footnotes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=12" title="Edit section: Footnotes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width reflist-lower-alpha"> <ol class="references"> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text">The renewed interest excluded papers written by Martin Duncan, Thomas Quinn, and <a href="/wiki/Scott_Tremaine" title="Scott Tremaine">Scott Tremaine</a> in 1987, which extended Hills' hypothesis with additional research.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2020)">citation needed</span></a></i>]</sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Accuracy_dispute#Disputed_statement" title="Wikipedia:Accuracy dispute"><span title="The material near this tag is possibly inaccurate or nonfactual. (July 2020)">dubious</span></a> – <a href="/wiki/Talk:Hills_cloud#Dubious" title="Talk:Hills cloud">discuss</a></i>]</sup> </span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=13" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626" /><div class="reflist reflist-columns references-column-width" style="column-width: 25em;"> <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">see <a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFVillemin" class="citation web cs1 cs1-prop-foreign-lang-source">Villemin, Gérard. <a rel="nofollow" class="external text" href="http://villemin.gerard.free.fr/Science/Asteroid.htm">"Astronomie, astéroïdes et comètes"</a> (in French).</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Astronomie%2C+ast%C3%A9ro%C3%AFdes+et+com%C3%A8tes&rft.aulast=Villemin&rft.aufirst=G%C3%A9rard&rft_id=http%3A%2F%2Fvillemin.gerard.free.fr%2FScience%2FAsteroid.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-SOA-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-SOA_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-SOA_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFDuncanQuinnTremaine1987" class="citation journal cs1">Duncan, Martin J.; Quinn, Thomas; <a href="/wiki/Scott_Tremaine" title="Scott Tremaine">Tremaine, Scott</a> (1987). <a rel="nofollow" class="external text" href="https://doi.org/10.1086%2F114571">"The Formation and Extent of the Solar System Comet Cloud"</a>. <i>The Astronomical Journal</i>. <b>94</b>: 1330. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1987AJ.....94.1330D">1987AJ.....94.1330D</a>. <a href="/wiki/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/10.1086%2F114571">10.1086/114571</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Astronomical+Journal&rft.atitle=The+Formation+and+Extent+of+the+Solar+System+Comet+Cloud&rft.volume=94&rft.pages=1330&rft.date=1987&rft_id=info%3Adoi%2F10.1086%2F114571&rft_id=info%3Abibcode%2F1987AJ.....94.1330D&rft.aulast=Duncan&rft.aufirst=Martin+J.&rft.au=Quinn%2C+Thomas&rft.au=Tremaine%2C+Scott&rft_id=https%3A%2F%2Fdoi.org%2F10.1086%252F114571&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFFernández1997" class="citation journal cs1"><a href="/wiki/Julio_%C3%81ngel_Fern%C3%A1ndez" title="Julio Ángel Fernández">Fernández, Julio Ángel</a> (1997). "The Formation of the Oort cloud and the primitive galactic environment". <i><a href="/wiki/Icarus_(journal)" title="Icarus (journal)">Icarus</a></i>. <b>129</b> (1): <span class="nowrap">106–</span>119. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1997Icar..129..106F">1997Icar..129..106F</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1006%2Ficar.1997.5754">10.1006/icar.1997.5754</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=The+Formation+of+the+Oort+cloud+and+the+primitive+galactic+environment&rft.volume=129&rft.issue=1&rft.pages=%3Cspan+class%3D%22nowrap%22%3E106-%3C%2Fspan%3E119&rft.date=1997&rft_id=info%3Adoi%2F10.1006%2Ficar.1997.5754&rft_id=info%3Abibcode%2F1997Icar..129..106F&rft.aulast=Fern%C3%A1ndez&rft.aufirst=Julio+%C3%81ngel&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-hills1981-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-hills1981_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-hills1981_5-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-hills1981_5-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFHills1981" class="citation journal cs1"><a href="/wiki/Jack_G._Hills" title="Jack G. Hills">Hills, Jack G.</a> (1981). <a rel="nofollow" class="external text" href="https://doi.org/10.1086%2F113058">"Comet showers and the steady-state infall of comets from the Oort Cloud"</a>. <i><a href="/wiki/Astronomical_Journal" class="mw-redirect" title="Astronomical Journal">Astronomical Journal</a></i>. <b>86</b>: <span class="nowrap">1730–</span>1740. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1981AJ.....86.1730H">1981AJ.....86.1730H</a>. <a href="/wiki/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/10.1086%2F113058">10.1086/113058</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Astronomical+Journal&rft.atitle=Comet+showers+and+the+steady-state+infall+of+comets+from+the+Oort+Cloud&rft.volume=86&rft.pages=%3Cspan+class%3D%22nowrap%22%3E1730-%3C%2Fspan%3E1740&rft.date=1981&rft_id=info%3Adoi%2F10.1086%2F113058&rft_id=info%3Abibcode%2F1981AJ.....86.1730H&rft.aulast=Hills&rft.aufirst=Jack+G.&rft_id=https%3A%2F%2Fdoi.org%2F10.1086%252F113058&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation book cs1"><a rel="nofollow" class="external text" href="http://fermat.nap.edu/books/0309043336/html/251.html"><i>Planetary Sciences: American and Soviet Research, Proceedings from the U.S.-U.S.S.R. Workshop on Planetary Sciences</i></a>. 1991. p. 251<span class="reference-accessdate">. Retrieved <span class="nowrap">7 November</span> 2007</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Planetary+Sciences%3A+American+and+Soviet+Research%2C+Proceedings+from+the+U.S.-U.S.S.R.+Workshop+on+Planetary+Sciences&rft.pages=251&rft.date=1991&rft_id=http%3A%2F%2Ffermat.nap.edu%2Fbooks%2F0309043336%2Fhtml%2F251.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span> <sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged January 2018">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citing_sources#What_information_to_include" title="Wikipedia:Citing sources"><span title="A complete citation is needed. article title, authors, editors (July 2020)">full citation needed</span></a></i>]</sup></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFÖpik1932" class="citation journal cs1"><a href="/wiki/Ernst_%C3%96pik" title="Ernst Öpik">Öpik, Ernst</a> (1932). "Note on Stellar Perturbations of Nearby Parabolic Orbits". <i>Proceedings of the American Academy of Arts and Sciences</i>. <b>67</b> (6): <span class="nowrap">169–</span>182. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1932PAAAS..67..169O">1932PAAAS..67..169O</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2307%2F20022899">10.2307/20022899</a>. <a href="/wiki/JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/20022899">20022899</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Proceedings+of+the+American+Academy+of+Arts+and+Sciences&rft.atitle=Note+on+Stellar+Perturbations+of+Nearby+Parabolic+Orbits&rft.volume=67&rft.issue=6&rft.pages=%3Cspan+class%3D%22nowrap%22%3E169-%3C%2Fspan%3E182&rft.date=1932&rft_id=https%3A%2F%2Fwww.jstor.org%2Fstable%2F20022899%23id-name%3DJSTOR&rft_id=info%3Adoi%2F10.2307%2F20022899&rft_id=info%3Abibcode%2F1932PAAAS..67..169O&rft.aulast=%C3%96pik&rft.aufirst=Ernst&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFOort1950" class="citation journal cs1"><a href="/wiki/Jan_Oort" title="Jan Oort">Oort, Jan</a> (1950). "The structure of the cloud of comets surrounding the Solar System and a hypothesis concerning its origin". <i>Bulletin of the Astronomical Institutes of the Netherlands</i>. <b>11</b>: <span class="nowrap">91–</span>110. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1950BAN....11...91O">1950BAN....11...91O</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Bulletin+of+the+Astronomical+Institutes+of+the+Netherlands&rft.atitle=The+structure+of+the+cloud+of+comets+surrounding+the+Solar+System+and+a+hypothesis+concerning+its+origin&rft.volume=11&rft.pages=%3Cspan+class%3D%22nowrap%22%3E91-%3C%2Fspan%3E110&rft.date=1950&rft_id=info%3Abibcode%2F1950BAN....11...91O&rft.aulast=Oort&rft.aufirst=Jan&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFMatson2012" class="citation web cs1">Matson, Dave E. (May 2012). <a rel="nofollow" class="external text" href="http://young-earth-creationism.blogspot.com/2012/05/oung-earth-evidence-short-period-comets.html">"Short-period Comets"</a>. <i>Young Earth Creationism</i> (blog). Young Earth Evidence.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Young+Earth+Creationism&rft.atitle=Short-period+Comets&rft.date=2012-05&rft.aulast=Matson&rft.aufirst=Dave+E.&rft_id=http%3A%2F%2Fyoung-earth-creationism.blogspot.com%2F2012%2F05%2Foung-earth-evidence-short-period-comets.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-Inner_oort_cloud2-10"><span class="mw-cite-backlink">^ <a href="#cite_ref-Inner_oort_cloud2_10-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Inner_oort_cloud2_10-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Inner_oort_cloud2_10-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Inner_oort_cloud2_10-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-Inner_oort_cloud2_10-4"><sup><i><b>e</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFBaileyStagg1988" class="citation journal cs1">Bailey, Mark E.; Stagg, C. Russell (1988). <a rel="nofollow" class="external text" href="https://www.researchgate.net/publication/234331606">"Cratering constraints on the inner Oort cloud: Steady-state models"</a>. <i>Monthly Notices of the Royal Astronomical Society</i>. <b>235</b>: <span class="nowrap">1–</span>32. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1988MNRAS.235....1B">1988MNRAS.235....1B</a>. <a href="/wiki/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%2Fmnras%2F235.1.1">10.1093/mnras/235.1.1</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Monthly+Notices+of+the+Royal+Astronomical+Society&rft.atitle=Cratering+constraints+on+the+inner+Oort+cloud%3A+Steady-state+models&rft.volume=235&rft.pages=%3Cspan+class%3D%22nowrap%22%3E1-%3C%2Fspan%3E32&rft.date=1988&rft_id=info%3Adoi%2F10.1093%2Fmnras%2F235.1.1&rft_id=info%3Abibcode%2F1988MNRAS.235....1B&rft.aulast=Bailey&rft.aufirst=Mark+E.&rft.au=Stagg%2C+C.+Russell&rft_id=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F234331606&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFChambon2000" class="citation web cs1 cs1-prop-foreign-lang-source">Chambon, Loïc, ed. 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(July 2020)">full citation needed</span></a></i>]</sup></span> </li> <li id="cite_note-Mike-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-Mike_20-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFBrownRabinowitzTrujillo2004" class="citation journal cs1"><a href="/wiki/Michael_E._Brown" title="Michael E. Brown">Brown, Michael E.</a>; <a href="/wiki/David_L._Rabinowitz" title="David L. Rabinowitz">Rabinowitz, David L.</a>; <a href="/wiki/Chad_Trujillo" title="Chad Trujillo">Trujillo, Chadwick A.</a> (2004). 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Jewitt">Jewitt, David C.</a>; <a href="/wiki/Alessandro_Morbidelli_(astronomer)" title="Alessandro Morbidelli (astronomer)">Morbidelli, Alessandro</a>; Rauer, Heike (2007). <i>Trans-Neptunian Objects and Comets</i>. Swiss Society for Astrophysics and Astronomy. Saas-Fee Advanced Course 35 (1 ed.). Berlin: Springer. p. 86. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-3-540-71957-1" title="Special:BookSources/978-3-540-71957-1"><bdi>978-3-540-71957-1</bdi></a>. <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/2007934029">2007934029</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Trans-Neptunian+Objects+and+Comets&rft.place=Berlin&rft.series=Saas-Fee+Advanced+Course+35&rft.pages=86&rft.edition=1&rft.pub=Springer&rft.date=2007&rft_id=info%3Alccn%2F2007934029&rft.isbn=978-3-540-71957-1&rft.aulast=Jewitt&rft.aufirst=David+C.&rft.au=Morbidelli%2C+Alessandro&rft.au=Rauer%2C+Heike&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></span> </li> <li id="cite_note-LykDyn-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-LykDyn_22-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFLykawkaTadashi2007" class="citation journal cs1">Lykawka, Patryk Sofia; Tadashi, Mukai (2007). 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(July 2020)">full citation needed</span></a></i>]</sup></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=14" title="Edit section: Further reading"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFHeislerTremaine1986" class="citation journal cs1">Heisler, Julia; Tremaine, Scott (1986). "The influence of the galactic tidal field on the Oort comet cloud". <i>Icarus</i>. <b>65</b> (1): 13. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1986Icar...65...13H">1986Icar...65...13H</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2F0019-1035%2886%2990060-6">10.1016/0019-1035(86)90060-6</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=The+influence+of+the+galactic+tidal+field+on+the+Oort+comet+cloud&rft.volume=65&rft.issue=1&rft.pages=13&rft.date=1986&rft_id=info%3Adoi%2F10.1016%2F0019-1035%2886%2990060-6&rft_id=info%3Abibcode%2F1986Icar...65...13H&rft.aulast=Heisler&rft.aufirst=Julia&rft.au=Tremaine%2C+Scott&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFDonesWeissmanLevisonDuncan2004" class="citation book cs1">Dones, Luke; Weissman, Paul R.; Levison, Harold F.; Duncan, Martin J. (2004). <a rel="nofollow" class="external text" href="http://www.lpi.usra.edu/books/CometsII/7031.pdf">"Oort cloud formation and dynamics"</a> <span class="cs1-format">(PDF)</span>. In Johnstone, Doug; <a href="/wiki/Fred_Adams" title="Fred Adams">Adams, Fred C.</a>; Lin, Doug N. C.; Neufeld, David A.; <a href="/wiki/Eve_Ostriker" title="Eve Ostriker">Ostriker, Eve C.</a> (eds.). <i>Star Formation in the Interstellar Medium: In Honor of David Hollenbach, Chris McKee, and Frank Shu</i>. ASP Conference Proceedings. Vol. 323. San Francisco, CA: Astronomical Society of the Pacific. p. 371. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2004ASPC..323.....J">2004ASPC..323.....J</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Oort+cloud+formation+and+dynamics&rft.btitle=Star+Formation+in+the+Interstellar+Medium%3A+In+Honor+of+David+Hollenbach%2C+Chris+McKee%2C+and+Frank+Shu&rft.place=San+Francisco%2C+CA&rft.series=ASP+Conference+Proceedings&rft.pages=371&rft.pub=Astronomical+Society+of+the+Pacific&rft.date=2004&rft_id=info%3Abibcode%2F2004ASPC..323.....J&rft.aulast=Dones&rft.aufirst=Luke&rft.au=Weissman%2C+Paul+R.&rft.au=Levison%2C+Harold+F.&rft.au=Duncan%2C+Martin+J.&rft_id=http%3A%2F%2Fwww.lpi.usra.edu%2Fbooks%2FCometsII%2F7031.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHills+cloud" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hills_cloud&action=edit&section=15" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Commons-logo.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/20px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/40px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> Media related to <a href="https://commons.wikimedia.org/wiki/Category:Hills_cloud" class="extiw" title="commons:Category:Hills cloud">Hills cloud</a> at Wikimedia Commons</li></ul> <div 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src="//upload.wikimedia.org/wikipedia/commons/4/43/Solar_System_Template_2.png" decoding="async" width="666" height="36" class="mw-file-element" data-file-width="666" data-file-height="36" usemap="#ImageMap_95c11910eb0c3136" /></span><map name="ImageMap_95c11910eb0c3136"><area href="/wiki/Sun" shape="rect" coords="0,0,90,35" alt="The Sun" title="The Sun" /><area href="/wiki/Mercury_(planet)" shape="circle" coords="112,18,6" alt="Mercury" title="Mercury" /><area href="/wiki/Venus" shape="circle" coords="153,18,8" alt="Venus" title="Venus" /><area href="/wiki/Moon" shape="circle" coords="204,10,4" alt="The Moon" title="The Moon" /><area href="/wiki/Earth" shape="circle" coords="195,18,8" alt="Earth" title="Earth" /><area href="/wiki/Mars" shape="circle" coords="233,18,8" alt="Mars" title="Mars" /><area href="/wiki/Moons_of_Mars" shape="circle" coords="241,13,3" alt="Phobos and Deimos" title="Phobos and Deimos" /><area href="/wiki/Ceres_(dwarf_planet)" shape="circle" coords="271,18,5" alt="Ceres" title="Ceres" /><area href="/wiki/Asteroid_belt" shape="rect" coords="256,0,288,35" alt="The main asteroid belt" title="The main asteroid belt" /><area href="/wiki/Jupiter" shape="circle" coords="316,19,15" alt="Jupiter" title="Jupiter" /><area href="/wiki/Moons_of_Jupiter" shape="circle" coords="329,6,6" alt="Moons of Jupiter" title="Moons of Jupiter" /><area href="/wiki/Rings_of_Jupiter" shape="rect" coords="298,18,335,20" alt="Rings of Jupiter" title="Rings of Jupiter" /><area href="/wiki/Saturn" shape="circle" coords="372,18,12" alt="Saturn" title="Saturn" /><area href="/wiki/Moons_of_Saturn" shape="circle" coords="381,7,6" alt="Moons of Saturn" title="Moons of Saturn" /><area href="/wiki/Rings_of_Saturn" shape="rect" coords="353,5,389,31" alt="Rings of Saturn" title="Rings of Saturn" /><area href="/wiki/Uranus" shape="circle" coords="418,18,12" alt="Uranus" title="Uranus" /><area href="/wiki/Moons_of_Uranus" shape="circle" coords="427,10,6" alt="Moons of Uranus" title="Moons of Uranus" /><area href="/wiki/Rings_of_Uranus" shape="rect" coords="408,4,429,34" alt="Rings of Uranus" title="Rings of Uranus" /><area href="/wiki/Neptune" shape="circle" coords="462,18,12" alt="Neptune" title="Neptune" /><area href="/wiki/Moons_of_Neptune" shape="circle" coords="471,10,5" alt="Moons of Neptune" title="Moons of Neptune" /><area href="/wiki/Rings_of_Neptune" shape="rect" coords="441,9,485,28" alt="Rings of Neptune" title="Rings of Neptune" /><area href="/wiki/Pluto" shape="circle" coords="504,18,12" alt="Pluto" title="Pluto" /><area href="/wiki/Moons_of_Pluto" shape="circle" coords="510,13,8" alt="Moons of Pluto" title="Moons of Pluto" /><area href="/wiki/Haumea" shape="circle" coords="534,18,12" alt="Haumea" title="Haumea" /><area href="/wiki/Moons_of_Haumea" shape="circle" coords="540,13,8" alt="Moons of Haumea" title="Moons of Haumea" /><area href="/wiki/Makemake" shape="circle" coords="567,18,12" alt="Makemake" title="Makemake" /><area href="/wiki/S/2015_(136472)_1" shape="circle" coords="571,13,8" alt="S/2015 (136472) 1" title="S/2015 (136472) 1" /><area href="/wiki/Kuiper_belt" shape="rect" coords="490,0,580,35" alt="The Kuiper Belt" title="The Kuiper Belt" /><area href="/wiki/Eris_(dwarf_planet)" shape="circle" coords="596,18,12" alt="Eris" title="Eris" /><area href="/wiki/Dysnomia_(moon)" shape="circle" coords="602,13,8" alt="Dysnomia" title="Dysnomia" /><area href="/wiki/Scattered_disc" shape="rect" coords="581,0,610,35" alt="The Scattered Disc" title="The Scattered Disc" /><area href="/wiki/Hills_cloud" shape="rect" coords="623,0,640,35" alt="The Hills Cloud" title="The Hills Cloud" /><area href="/wiki/Oort_cloud" shape="rect" coords="641,0,666,35" alt="The Oort Cloud" title="The Oort Cloud" /></map><figcaption></figcaption></figure> <ul><li><a href="/wiki/Sun" title="Sun">Sun</a></li> <li><a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a></li> <li><a href="/wiki/Venus" title="Venus">Venus</a></li> <li><a href="/wiki/Earth" title="Earth">Earth</a></li> <li><a href="/wiki/Mars" title="Mars">Mars</a></li> <li><i><a href="/wiki/Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></i></li> <li><a href="/wiki/Jupiter" title="Jupiter">Jupiter</a></li> <li><a href="/wiki/Saturn" title="Saturn">Saturn</a></li> <li><a href="/wiki/Uranus" title="Uranus">Uranus</a></li> <li><a href="/wiki/Neptune" title="Neptune">Neptune</a></li> <li><i><a href="/wiki/Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a></i></li> <li><i><a href="/wiki/Pluto" title="Pluto">Pluto</a></i></li> <li><i><a href="/wiki/Haumea" title="Haumea">Haumea</a></i></li> <li><i><a href="/wiki/Quaoar" title="Quaoar">Quaoar</a></i></li> <li><i><a href="/wiki/Makemake" title="Makemake">Makemake</a></i></li> <li><i><a href="/wiki/Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a></i></li> <li><i><a href="/wiki/Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a></i></li> <li><i><a href="/wiki/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,_minors275" scope="row" class="navbox-group" style="width:1%;text-align:center;"><a href="/wiki/Planet" title="Planet">Planets</a>,<br /> <a href="/wiki/Dwarf_planet" title="Dwarf planet">dwarfs</a>, <br /> <a href="/wiki/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="/wiki/Terrestrial_planet" title="Terrestrial planet">Terrestrials</a> <ul><li><a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a></li> <li><a href="/wiki/Venus" title="Venus">Venus</a></li> <li><a href="/wiki/Earth" title="Earth">Earth</a></li> <li><a href="/wiki/Mars" title="Mars">Mars</a></li></ul></li> <li><a href="/wiki/Giant_planet" title="Giant planet">Giants</a> <ul><li><a href="/wiki/Gas_giant" title="Gas giant">Gas</a> <ul><li><a href="/wiki/Jupiter" title="Jupiter">Jupiter</a></li> <li><a href="/wiki/Saturn" title="Saturn">Saturn</a></li></ul></li> <li><a href="/wiki/Ice_giant" title="Ice giant">Ice</a> <ul><li><a href="/wiki/Uranus" title="Uranus">Uranus</a></li> <li><a href="/wiki/Neptune" title="Neptune">Neptune</a></li></ul></li></ul></li> <li><a href="/wiki/Dwarf_planet" title="Dwarf planet">Dwarfs</a> <ul><li><a href="/wiki/Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></li> <li><a href="/wiki/Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a></li> <li><a href="/wiki/Pluto" title="Pluto">Pluto</a></li> <li><a href="/wiki/Haumea" title="Haumea">Haumea</a></li> <li><a href="/wiki/Quaoar" title="Quaoar">Quaoar</a></li> <li><a href="/wiki/Makemake" title="Makemake">Makemake</a></li> <li><a href="/wiki/Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a></li> <li><a href="/wiki/Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a></li> <li><a href="/wiki/Sedna_(dwarf_planet)" title="Sedna (dwarf planet)">Sedna</a></li></ul></li> <li><a href="/wiki/Minor_planet" title="Minor planet">Large Minor Planets</a> <ul><li><a href="/wiki/120347_Salacia" title="120347 Salacia">Salacia</a></li> <li><a href="/wiki/20000_Varuna" title="20000 Varuna">Varuna</a></li> <li><a href="/wiki/28978_Ixion" title="28978 Ixion">Ixion</a></li> <li><a href="/wiki/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="/wiki/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="/wiki/Moon" title="Moon">Moon</a> <ul><li><a href="/wiki/Claimed_moons_of_Earth" title="Claimed moons of Earth">Claimed</a></li></ul></li></ul></li> <li><a href="/wiki/Moons_of_Mars" title="Moons of Mars">Mars</a> <ul><li><a href="/wiki/Phobos_(moon)" title="Phobos (moon)">Phobos</a></li> <li><a href="/wiki/Deimos_(moon)" title="Deimos (moon)">Deimos</a></li></ul></li> <li><a href="/wiki/Moons_of_Jupiter" title="Moons of Jupiter">Jupiter</a> <ul><li><a href="/wiki/Ganymede_(moon)" title="Ganymede (moon)">Ganymede</a></li> <li><a href="/wiki/Callisto_(moon)" title="Callisto (moon)">Callisto</a></li> <li><a href="/wiki/Io_(moon)" title="Io (moon)">Io</a></li> <li><a href="/wiki/Europa_(moon)" title="Europa (moon)">Europa</a></li> <li><a href="/wiki/Moons_of_Jupiter#List" title="Moons of Jupiter">all 95</a></li></ul></li> <li><a href="/wiki/Moons_of_Saturn" title="Moons of Saturn">Saturn</a> <ul><li><a href="/wiki/Titan_(moon)" title="Titan (moon)">Titan</a></li> <li><a href="/wiki/Rhea_(moon)" title="Rhea (moon)">Rhea</a></li> <li><a href="/wiki/Iapetus_(moon)" title="Iapetus (moon)">Iapetus</a></li> <li><a href="/wiki/Dione_(moon)" title="Dione (moon)">Dione</a></li> <li><a href="/wiki/Tethys_(moon)" title="Tethys (moon)">Tethys</a></li> <li><a href="/wiki/Enceladus" title="Enceladus">Enceladus</a></li> <li><a href="/wiki/Mimas" title="Mimas">Mimas</a></li> <li><a href="/wiki/Hyperion_(moon)" title="Hyperion (moon)">Hyperion</a></li> <li><a href="/wiki/Phoebe_(moon)" title="Phoebe (moon)">Phoebe</a></li> <li><a href="/wiki/Moons_of_Saturn#List" title="Moons of Saturn">all 274</a></li></ul></li> <li><a href="/wiki/Moons_of_Uranus" title="Moons of Uranus">Uranus</a> <ul><li><a href="/wiki/Titania_(moon)" title="Titania (moon)">Titania</a></li> <li><a href="/wiki/Oberon_(moon)" title="Oberon (moon)">Oberon</a></li> <li><a href="/wiki/Umbriel" title="Umbriel">Umbriel</a></li> <li><a href="/wiki/Ariel_(moon)" title="Ariel (moon)">Ariel</a></li> <li><a href="/wiki/Miranda_(moon)" title="Miranda (moon)">Miranda</a></li> <li><a href="/wiki/Moons_of_Uranus#List" title="Moons of Uranus">all 28</a></li></ul></li> <li><a href="/wiki/Moons_of_Neptune" title="Moons of Neptune">Neptune</a> <ul><li><a href="/wiki/Triton_(moon)" title="Triton (moon)">Triton</a></li> <li><a href="/wiki/Proteus_(moon)" title="Proteus (moon)">Proteus</a></li> <li><a href="/wiki/Nereid_(moon)" title="Nereid (moon)">Nereid</a></li> <li><a href="/wiki/Moons_of_Neptune#List" title="Moons of Neptune">all 16</a></li></ul></li> <li><a href="/wiki/Moons_of_Pluto" title="Moons of Pluto">Pluto</a> <ul><li><a href="/wiki/Charon_(moon)" title="Charon (moon)">Charon</a></li> <li><a href="/wiki/Nix_(moon)" title="Nix (moon)">Nix</a></li> <li><a href="/wiki/Hydra_(moon)" title="Hydra (moon)">Hydra</a></li> <li><a href="/wiki/Kerberos_(moon)" title="Kerberos (moon)">Kerberos</a></li> <li><a href="/wiki/Styx_(moon)" title="Styx (moon)">Styx</a></li></ul></li> <li><a href="/wiki/Orcus_(dwarf_planet)" title="Orcus (dwarf planet)">Orcus</a> <ul><li><a href="/wiki/Vanth_(moon)" title="Vanth (moon)">Vanth</a></li></ul></li> <li><a href="/wiki/Moons_of_Haumea" title="Moons of Haumea">Haumea</a> <ul><li><a href="/wiki/Hi%CA%BBiaka_(moon)" title="Hiʻiaka (moon)">Hiʻiaka</a></li> <li><a href="/wiki/Namaka_(moon)" title="Namaka (moon)">Namaka</a></li></ul></li> <li><a href="/wiki/Quaoar" title="Quaoar">Quaoar</a> <ul><li><a href="/wiki/Weywot" title="Weywot">Weywot</a></li></ul></li> <li><a href="/wiki/Makemake" title="Makemake">Makemake</a> <ul><li><a href="/wiki/S/2015_(136472)_1" title="S/2015 (136472) 1">S/2015 (136472) 1</a></li></ul></li> <li><a href="/wiki/Gonggong_(dwarf_planet)" title="Gonggong (dwarf planet)">Gonggong</a> <ul><li><a href="/wiki/Xiangliu_(moon)" title="Xiangliu (moon)">Xiangliu</a></li></ul></li> <li><a href="/wiki/Eris_(dwarf_planet)" title="Eris (dwarf planet)">Eris</a> <ul><li><a href="/wiki/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="/wiki/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="/wiki/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="/wiki/Star_formation" title="Star formation">Star formation</a></li> <li><a href="/wiki/Accretion_(astrophysics)" title="Accretion (astrophysics)">Accretion</a></li> <li><a href="/wiki/Accretion_disk" title="Accretion disk">Accretion disk</a> <ul><li><a href="/wiki/Accretion_disk#Excretion_disk" title="Accretion disk">Excretion</a></li></ul></li> <li><a href="/wiki/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="/wiki/Capture_of_Triton" title="Capture of Triton">Capture of Triton</a></li></ul></li> <li><a href="/wiki/Circumplanetary_disk" title="Circumplanetary disk">Circumplanetary disk</a></li> <li><a href="/wiki/Circumstellar_disc" title="Circumstellar disc">Circumstellar disc</a></li> <li><a href="/wiki/Circumstellar_envelope" title="Circumstellar envelope">Circumstellar envelope</a></li> <li><a href="/wiki/Coatlicue_(star)" title="Coatlicue (star)">Coatlicue</a></li> <li><a href="/wiki/Co-orbital_configuration" title="Co-orbital configuration">Co-orbital configuration</a> <ul><li><a href="/wiki/Co-orbital_configuration#Trojan_moons" title="Co-orbital configuration">Saturn Moons</a></li></ul></li> <li><a href="/wiki/Cosmic_dust" title="Cosmic dust">Cosmic dust</a></li> <li><a href="/wiki/Debris_disk" title="Debris disk">Debris disk</a></li> <li><a href="/wiki/Detached_object" title="Detached object">Detached object</a></li> <li><a href="/wiki/Ice_giant#Disk_instability" title="Ice giant">Disk instability</a></li> <li><a href="/wiki/Exoplanetary_Circumstellar_Environments_and_Disk_Explorer" title="Exoplanetary Circumstellar Environments and Disk Explorer">EXCEDE</a></li> <li><a href="/wiki/Exozodiacal_dust" title="Exozodiacal dust">Exozodiacal dust</a></li> <li><a href="/wiki/Extraterrestrial_materials" title="Extraterrestrial materials">Extraterrestrial materials</a> <ul><li><a href="/wiki/Extraterrestrial_sample_curation" title="Extraterrestrial sample curation">Curation</a></li> <li><a href="/wiki/Sample-return_mission" title="Sample-return mission">Sample-return mission</a></li></ul></li> <li><a href="/wiki/Frost_line_(astrophysics)" title="Frost line (astrophysics)">Frost/Ice/Snow line</a></li> <li><a href="/wiki/Giant-impact_hypothesis" title="Giant-impact hypothesis">Giant-impact hypothesis</a></li> <li><a href="/wiki/Grand_tack_hypothesis" title="Grand tack hypothesis">Grand tack hypothesis</a></li> <li><a href="/wiki/Gravitational_collapse" title="Gravitational collapse">Gravitational collapse</a></li> <li><a class="mw-selflink selflink">Hills cloud</a></li> <li><a href="/wiki/Hill_sphere" title="Hill sphere">Hill sphere</a></li> <li><a href="/wiki/Interplanetary_dust_cloud" title="Interplanetary dust cloud">Interplanetary dust cloud</a></li> <li><a href="/wiki/Interplanetary_medium" title="Interplanetary medium">Interplanetary medium/space</a></li> <li><a href="/wiki/Interstellar_cloud" title="Interstellar cloud">Interstellar cloud</a></li> <li><a href="/wiki/Interstellar_medium" title="Interstellar medium">Interstellar medium</a></li> <li><a href="/wiki/Outer_space#Interstellar_space" title="Outer space">Interstellar space</a></li> <li><a href="/wiki/Kordylewski_cloud" title="Kordylewski cloud">Kordylewski cloud</a></li> <li><a href="/wiki/Kuiper_belt" title="Kuiper belt">Kuiper belt</a></li> <li><a href="/wiki/Kuiper_cliff" class="mw-redirect" title="Kuiper cliff">Kuiper cliff</a></li> <li><a href="/wiki/Late_Heavy_Bombardment" title="Late Heavy Bombardment">Late Heavy Bombardment</a></li> <li><a href="/wiki/Molecular_cloud" title="Molecular cloud">Molecular cloud</a></li> <li><a href="/wiki/Nebular_hypothesis" title="Nebular hypothesis">Nebular hypothesis</a></li> <li><a href="/wiki/Nice_model" title="Nice model">Nice model</a> <ul><li><a href="/wiki/Nice_2_model" title="Nice 2 model">Nice 2 model</a></li> <li><a href="/wiki/Five-planet_Nice_model" title="Five-planet Nice model">Five-planet Nice model</a></li></ul></li> <li><a href="/wiki/Oort_cloud" title="Oort cloud">Oort cloud</a></li> <li><a href="/wiki/Outer_space" title="Outer space">Outer space</a></li> <li><a href="/wiki/Planet" title="Planet">Planet</a> <ul><li><a href="/wiki/Disrupted_planet" title="Disrupted planet">Disrupted</a></li> <li><a href="/wiki/Planetary_migration" title="Planetary migration">Migration</a></li> <li><a href="/wiki/Planetary_system" title="Planetary system">System</a></li> <li><a href="/wiki/Planetesimal" title="Planetesimal">Planetesimal</a></li> <li><a href="/wiki/Nebular_hypothesis#Formation_of_planets" title="Nebular hypothesis">Formation</a> <ul><li><a href="/wiki/Stellar_collision#Formation_of_planets" title="Stellar collision">Merging stars</a></li></ul></li> <li><a href="/wiki/Protoplanetary_disk" title="Protoplanetary disk">Protoplanetary disk</a></li></ul></li> <li><a href="/wiki/Ring_system" title="Ring system">Ring system</a></li> <li><a href="/wiki/Roche_limit" title="Roche limit">Roche limit</a> <ul><li><a href="/wiki/Roche_limit#Roche_limit,_Hill_sphere_and_radius_of_the_planet" title="Roche limit">vs. Hill sphere</a></li></ul></li> <li><a href="/wiki/Rubble_pile" title="Rubble pile">Rubble pile</a></li> <li><a href="/wiki/Scattered_disc" title="Scattered disc">Scattered disc</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="/wiki/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="/wiki/Rings_of_Earth" title="Rings of Earth">Earth</a>?</li> <li><a href="/wiki/Rings_of_Jupiter" title="Rings of Jupiter">Jovian</a></li> <li><a href="/wiki/Rings_of_Saturn" title="Rings of Saturn">Saturnian</a> (<a href="/wiki/Rings_of_Rhea" title="Rings of Rhea">Rhean</a>?)</li> <li><a href="/wiki/Rings_of_Chariklo" title="Rings of Chariklo">Charikloan</a></li> <li><a href="/wiki/2060_Chiron#Rings" title="2060 Chiron">Chironean</a></li> <li><a href="/wiki/Rings_of_Uranus" title="Rings of Uranus">Uranian</a></li> <li><a href="/wiki/Rings_of_Neptune" title="Rings of Neptune">Neptunian</a></li> <li><a href="/wiki/Haumea#Ring" title="Haumea">Haumean</a></li> <li><a href="/wiki/Quaoar#Rings" title="Quaoar">Quaoarian</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;"><a href="/wiki/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-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Claimed_moons_of_Earth#Other_claims" title="Claimed moons of Earth">Bagby's moon</a></li> <li><a href="/wiki/Chiron_(hypothetical_moon)" title="Chiron (hypothetical moon)">Chiron</a></li> <li><a href="/wiki/Coatlicue_(star)" title="Coatlicue (star)">Coatlicue</a></li> <li><a href="/wiki/Counter-Earth" title="Counter-Earth">Counter-Earth</a></li> <li><a href="/wiki/Chrysalis_(hypothetical_moon)" title="Chrysalis (hypothetical moon)">Chrysalis</a></li> <li><a href="/wiki/Fifth_Giant" title="Fifth Giant">Fifth Giant</a></li> <li><a href="/wiki/Hyperion_(hypothetical_planet)" title="Hyperion (hypothetical planet)">Hyperion</a></li> <li><a href="/wiki/Planetary_objects_proposed_in_religion,_astrology,_ufology_and_pseudoscience#Lilith" title="Planetary objects proposed in religion, astrology, ufology and pseudoscience">Lilith</a></li> <li><a href="/wiki/Hypothetical_moon_of_Mercury" title="Hypothetical moon of Mercury">Mercury's moon</a></li> <li><a href="/wiki/Neith_(hypothetical_moon)" title="Neith (hypothetical moon)">Neith</a></li> <li><a href="/wiki/Nemesis_(hypothetical_star)" title="Nemesis (hypothetical star)">Nemesis</a></li> <li><a href="/wiki/Nibiru_cataclysm" title="Nibiru cataclysm">Nibiru</a></li> <li><a href="/wiki/Claimed_moons_of_Earth#Petit's_moon" title="Claimed moons of Earth">Petit's moon</a></li> <li><a href="/wiki/Phaeton_(hypothetical_planet)" title="Phaeton (hypothetical planet)">Phaeton</a></li> <li><a href="/wiki/Planet_Nine" title="Planet Nine">Planet Nine</a></li> <li><a href="/wiki/Planets_beyond_Neptune#Kuiper_cliff_and_"Planet_Ten"" title="Planets beyond Neptune">Planet Ten</a></li> <li><a href="/wiki/Planet_V" title="Planet V">Planet V</a></li> <li><a href="/wiki/Planets_beyond_Neptune#Planet_X" title="Planets beyond Neptune">Planet X</a></li> <li><a href="/wiki/Subsatellite" title="Subsatellite">Subsatellites</a></li> <li><a href="/wiki/Synestia#Giant-impact_hypothesis" title="Synestia">Synestia</a></li> <li><a href="/wiki/Theia_(planet)" title="Theia (planet)">Theia</a></li> <li><a href="/wiki/Themis_(hypothetical_moon)" title="Themis (hypothetical moon)">Themis</a></li> <li><a href="/wiki/Tyche_(hypothetical_planet)" title="Tyche (hypothetical planet)">Tyche</a></li> <li><a href="/wiki/Vulcan_(hypothetical_planet)" title="Vulcan (hypothetical planet)">Vulcan</a> <ul><li><a href="/wiki/Vulcanoid" title="Vulcanoid">Vulcanoids</a></li></ul></li> <li><a href="/wiki/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;"><a href="/wiki/Space_exploration" title="Space exploration">Exploration</a><br />(<a href="/wiki/Outline_of_space_exploration" title="Outline of space exploration">outline</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="/wiki/Space_colonization" title="Space colonization">Colonization</a></li> <li><a href="/wiki/Discovery_and_exploration_of_the_Solar_System" title="Discovery and exploration of the Solar System">Discovery</a> <ul><li><a href="/wiki/Astronomy" title="Astronomy">astronomy</a></li> <li><a href="/wiki/Historical_models_of_the_Solar_System" title="Historical models of the Solar System">historical models</a></li> <li><a href="/wiki/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="/wiki/Space_probe" class="mw-redirect" title="Space probe">Space probes</a> <ul><li><a href="/wiki/Timeline_of_Solar_System_exploration" title="Timeline of Solar System exploration">timeline</a></li> <li><a href="/wiki/List_of_Solar_System_probes" title="List of Solar System probes">list</a></li></ul></li> <li><a href="/wiki/Human_spaceflight" title="Human spaceflight">Human spaceflight</a> <ul><li><a href="/wiki/Space_station" title="Space station">space stations</a></li> <li><a href="/wiki/List_of_crewed_spacecraft" title="List of crewed spacecraft">list</a></li> <li><a href="/wiki/Human_spaceflight_programs" title="Human spaceflight programs">programs</a></li></ul></li> <li><a href="/wiki/Exploration_of_Mercury" title="Exploration of Mercury">Mercury</a></li> <li><a href="/wiki/Observations_and_explorations_of_Venus" title="Observations and explorations of Venus">Venus</a></li> <li><a href="/wiki/Exploration_of_the_Moon" title="Exploration of the Moon">Moon</a> <ul><li><a href="/wiki/Lunar_resources" title="Lunar resources">mining</a></li></ul></li> <li><a href="/wiki/Exploration_of_Mars" title="Exploration of Mars">Mars</a></li> <li><a href="/wiki/Ceres_(dwarf_planet)#Exploration" title="Ceres (dwarf planet)">Ceres</a></li> <li><a href="/wiki/Asteroid#Exploration" title="Asteroid">Asteroids</a> <ul><li><a href="/wiki/Asteroid_mining" title="Asteroid mining">mining</a></li></ul></li> <li><a href="/wiki/List_of_missions_to_comets" title="List of missions to comets">Comets</a></li> <li><a href="/wiki/Exploration_of_Jupiter" title="Exploration of Jupiter">Jupiter</a></li> <li><a href="/wiki/Exploration_of_Saturn" title="Exploration of Saturn">Saturn</a></li> <li><a href="/wiki/Exploration_of_Uranus" title="Exploration of Uranus">Uranus</a></li> <li><a href="/wiki/Exploration_of_Neptune" title="Exploration of Neptune">Neptune</a></li> <li><a href="/wiki/Exploration_of_Pluto" title="Exploration of Pluto">Pluto</a></li> <li><a href="/wiki/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="/wiki/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-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Comet" title="Comet">Comets</a></li> <li><a href="/wiki/Damocloid" title="Damocloid">Damocloids</a></li> <li><a href="/wiki/Meteoroid" title="Meteoroid">Meteoroids</a></li> <li><a href="/wiki/Minor_planet" title="Minor planet">Minor planets</a> <ul><li><a href="/wiki/Meanings_of_minor-planet_names" title="Meanings of minor-planet names">names and meanings</a></li> <li><a href="/wiki/Minor-planet_moon" title="Minor-planet moon">moons</a></li></ul></li> <li><a href="/wiki/Planetesimal" title="Planetesimal">Planetesimal</a></li> <li>Planetary orbit-crossers <ul><li><a href="/wiki/List_of_Mercury-crossing_minor_planets" title="List of Mercury-crossing minor planets">Mercury</a></li> <li><a href="/wiki/List_of_Venus-crossing_minor_planets" title="List of Venus-crossing minor planets">Venus</a></li> <li><a href="/wiki/List_of_Earth-crossing_asteroids" title="List of Earth-crossing asteroids">Earth</a></li> <li><a href="/wiki/List_of_Mars-crossing_minor_planets" title="List of Mars-crossing minor planets">Mars</a></li> <li><a href="/wiki/List_of_Jupiter-crossing_minor_planets" title="List of Jupiter-crossing minor planets">Jupiter</a></li> <li><a href="/wiki/List_of_Saturn-crossing_minor_planets" title="List of Saturn-crossing minor planets">Saturn</a></li> <li><a href="/wiki/List_of_Uranus-crossing_minor_planets" title="List of Uranus-crossing minor planets">Uranus</a></li> <li><a href="/wiki/List_of_Neptune-crossing_minor_planets" title="List of Neptune-crossing minor planets">Neptune</a></li></ul></li> <li><a href="/wiki/Trojan_(celestial_body)" title="Trojan (celestial body)">Trojans</a> <ul><li><a href="/wiki/2013_ND15" title="2013 ND15">Venus</a></li> <li><a href="/wiki/Earth_trojan" title="Earth trojan">Earth</a></li> <li><a href="/wiki/Mars_trojan" title="Mars trojan">Mars</a></li> <li><a href="/wiki/Jupiter_trojan" title="Jupiter trojan">Jupiter</a> <ul><li><a href="/wiki/List_of_Jupiter_trojans_(Trojan_camp)" title="List of Jupiter trojans (Trojan camp)">Trojan camp</a></li> <li><a href="/wiki/List_of_Jupiter_trojans_(Greek_camp)" title="List of Jupiter trojans (Greek camp)">Greek camp</a></li></ul></li> <li><a href="/wiki/2019_UO14" title="2019 UO14">Saturn</a></li> <li><a href="/wiki/Uranus_trojans" title="Uranus trojans">Uranus</a></li> <li><a href="/wiki/Neptune_trojan" title="Neptune trojan">Neptune</a></li></ul></li> <li><a href="/wiki/Near-Earth_object" title="Near-Earth object">Near-Earth objects</a> <ul><li><a href="/wiki/Near-Earth_object#Near-Earth_asteroids" title="Near-Earth object">NEAs</a></li></ul></li> <li><a href="/wiki/Asteroid_belt" title="Asteroid belt">Asteroid belt</a></li> <li><a href="/wiki/Asteroid" title="Asteroid">Asteroids</a> <ul><li><a href="/wiki/Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></li> <li><a href="/wiki/4_Vesta" title="4 Vesta">Vesta</a></li> <li><a href="/wiki/2_Pallas" title="2 Pallas">Pallas</a></li> <li><a href="/wiki/10_Hygiea" title="10 Hygiea">Hygiea</a></li> <li><a href="/wiki/Active_asteroid" title="Active asteroid">active</a></li> <li><a href="/wiki/List_of_minor_planets" title="List of minor planets">List</a></li> <li><a href="/wiki/Asteroid_family" title="Asteroid family">families</a></li> <li><a href="/wiki/Potentially_hazardous_object" title="Potentially hazardous object">PHA</a></li> <li><a href="/wiki/List_of_exceptional_asteroids" title="List of exceptional asteroids">exceptional</a></li> <li><a href="/wiki/Kirkwood_gap" title="Kirkwood gap">Kirkwood gap</a></li></ul></li> <li><a href="/wiki/Centaur_(small_Solar_System_body)" title="Centaur (small Solar System body)">Centaurs</a></li> <li><a href="/wiki/Trans-Neptunian_object" title="Trans-Neptunian object">Trans-Neptunian objects</a> <ul><li><a href="/wiki/Kuiper_belt" title="Kuiper belt">Kuiper belt</a> <ul><li><a href="/wiki/Classical_Kuiper_belt_object" title="Classical Kuiper belt object">Cubewanos</a></li> <li><a href="/wiki/Plutino" title="Plutino">Plutinos</a></li></ul></li> <li><a href="/wiki/Detached_object" title="Detached object">Detached objects</a></li> <li><a href="/wiki/Sednoid" title="Sednoid">Sednoids</a></li> <li><a href="/wiki/Scattered_disc" title="Scattered disc">Scattered disc</a></li> <li><a class="mw-selflink selflink">Hills cloud</a></li> <li><a href="/wiki/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;">Lists</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="/wiki/Lists_of_comets" title="Lists of comets">Comets</a></li> <li><a href="/wiki/List_of_possible_dwarf_planets" title="List of possible dwarf planets">Possible dwarf planets</a></li> <li><a href="/wiki/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="/wiki/List_of_minor_planets" title="List of minor planets">Minor planets</a></li> <li><a href="/wiki/List_of_natural_satellites" title="List of natural satellites">Natural satellites</a></li> <li><a href="/wiki/Solar_System_model" title="Solar System model">Solar System models</a></li> <li><a href="/wiki/List_of_Solar_System_objects" title="List of Solar System objects">Solar System objects</a> <ul><li><a href="/wiki/List_of_Solar_System_objects_by_size" title="List of Solar System objects by size">by size</a></li> <li><a href="/wiki/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="/wiki/List_of_interstellar_and_circumstellar_molecules" title="List of interstellar and circumstellar molecules">Interstellar and circumstellar molecules</a></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="/wiki/Double_planet" title="Double planet">Double planet</a></li> <li><a href="/wiki/Lagrange_point" title="Lagrange point">Lagrange point</a></li> <li><a href="/wiki/Moonlet" title="Moonlet">Moonlet</a></li> <li><a href="/wiki/Syzygy_(astronomy)" title="Syzygy (astronomy)">Syzygy</a></li> <li><a href="/wiki/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="/wiki/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><img alt="" 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title="Portal:Astronomy">Astronomy portal</a></li> <li><span class="nowrap"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/The_Earth_seen_from_Apollo_17_with_transparent_background.png/19px-The_Earth_seen_from_Apollo_17_with_transparent_background.png" decoding="async" width="19" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/The_Earth_seen_from_Apollo_17_with_transparent_background.png/29px-The_Earth_seen_from_Apollo_17_with_transparent_background.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/43/The_Earth_seen_from_Apollo_17_with_transparent_background.png/38px-The_Earth_seen_from_Apollo_17_with_transparent_background.png 2x" data-file-width="2790" data-file-height="2776" /></span></span> </span><a href="/wiki/Portal:Earth_sciences" title="Portal:Earth sciences">Earth sciences portal</a></li></ul> <p><a href="/wiki/Solar_System" title="Solar System">Solar 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