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aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="開/收內容一覽" > <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 cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">開/收內容一覽</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">原恆星</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="去睇另一種語文嘅文章。有60種語言版本。" > <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-60" 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">60種語言</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/Protoster" title="Protoster – 南非荷蘭文" lang="af" hreflang="af" data-title="Protoster" data-language-autonym="Afrikaans" data-language-local-name="南非荷蘭文" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Protoestrela" title="Protoestrela – 阿拉貢文" lang="an" hreflang="an" data-title="Protoestrela" data-language-autonym="Aragonés" data-language-local-name="阿拉貢文" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%86%D8%AC%D9%85_%D8%A3%D9%88%D9%84%D9%8A" title="نجم أولي – 阿拉伯文" lang="ar" hreflang="ar" data-title="نجم أولي" data-language-autonym="العربية" data-language-local-name="阿拉伯文" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Protoestrella" title="Protoestrella – 阿斯圖里亞文" lang="ast" hreflang="ast" data-title="Protoestrella" data-language-autonym="Asturianu" data-language-local-name="阿斯圖里亞文" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Protoulduz" title="Protoulduz – 亞塞拜然文" lang="az" hreflang="az" data-title="Protoulduz" data-language-autonym="Azərbaycanca" data-language-local-name="亞塞拜然文" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D1%80%D0%B0%D1%82%D0%B0%D0%B7%D0%BE%D1%80%D0%BA%D0%B0" title="Пратазорка – 白俄羅斯文" lang="be" hreflang="be" data-title="Пратазорка" data-language-autonym="Беларуская" data-language-local-name="白俄羅斯文" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%B7%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Протозвезда – 保加利亞文" lang="bg" hreflang="bg" data-title="Протозвезда" data-language-autonym="Български" data-language-local-name="保加利亞文" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%86%E0%A6%A6%E0%A7%8D%E0%A6%AF%E0%A6%A8%E0%A6%95%E0%A7%8D%E0%A6%B7%E0%A6%A4%E0%A7%8D%E0%A6%B0" title="আদ্যনক্ষত্র – 孟加拉文" lang="bn" hreflang="bn" data-title="আদ্যনক্ষত্র" data-language-autonym="বাংলা" data-language-local-name="孟加拉文" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Protozvijezda" title="Protozvijezda – 波士尼亞文" lang="bs" hreflang="bs" data-title="Protozvijezda" data-language-autonym="Bosanski" data-language-local-name="波士尼亞文" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Protoestrella" title="Protoestrella – 加泰羅尼亞文" lang="ca" hreflang="ca" data-title="Protoestrella" data-language-autonym="Català" data-language-local-name="加泰羅尼亞文" 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/Protohv%C4%9Bzda" title="Protohvězda – 捷克文" lang="cs" hreflang="cs" data-title="Protohvězda" data-language-autonym="Čeština" data-language-local-name="捷克文" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%C3%A7%C4%83%D0%BB%D1%82%C4%83%D1%80" title="Протоçăлтăр – 楚瓦什文" lang="cv" hreflang="cv" data-title="Протоçăлтăр" data-language-autonym="Чӑвашла" data-language-local-name="楚瓦什文" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Protostern" title="Protostern – 德文" lang="de" hreflang="de" data-title="Protostern" data-language-autonym="Deutsch" data-language-local-name="德文" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A0%CF%81%CF%89%CF%84%CE%BF%CE%B1%CF%83%CF%84%CE%AD%CF%81%CE%B1%CF%82" title="Πρωτοαστέρας – 希臘文" lang="el" hreflang="el" data-title="Πρωτοαστέρας" data-language-autonym="Ελληνικά" data-language-local-name="希臘文" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Protostar" title="Protostar – 英文" lang="en" hreflang="en" data-title="Protostar" data-language-autonym="English" data-language-local-name="英文" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Proto-stelo" title="Proto-stelo – 世界文" lang="eo" hreflang="eo" data-title="Proto-stelo" data-language-autonym="Esperanto" data-language-local-name="世界文" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Protoestrella" title="Protoestrella – 西班牙文" lang="es" hreflang="es" data-title="Protoestrella" data-language-autonym="Español" data-language-local-name="西班牙文" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Protot%C3%A4ht" title="Prototäht – 愛沙尼亞文" lang="et" hreflang="et" data-title="Prototäht" data-language-autonym="Eesti" data-language-local-name="愛沙尼亞文" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Protoizar" title="Protoizar – 巴斯克文" lang="eu" hreflang="eu" data-title="Protoizar" data-language-autonym="Euskara" data-language-local-name="巴斯克文" 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/%D9%BE%DB%8C%D8%B4%E2%80%8C%D8%B3%D8%AA%D8%A7%D8%B1%D9%87" title="پیش‌ستاره – 波斯文" lang="fa" hreflang="fa" data-title="پیش‌ستاره" data-language-autonym="فارسی" data-language-local-name="波斯文" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Protot%C3%A4hti" title="Prototähti – 芬蘭文" lang="fi" hreflang="fi" data-title="Prototähti" data-language-autonym="Suomi" data-language-local-name="芬蘭文" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Proto%C3%A9toile" title="Protoétoile – 法文" lang="fr" hreflang="fr" data-title="Protoétoile" data-language-autonym="Français" data-language-local-name="法文" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Pr%C3%B3tair%C3%A9alta" title="Prótairéalta – 愛爾蘭文" lang="ga" hreflang="ga" data-title="Prótairéalta" data-language-autonym="Gaeilge" data-language-local-name="愛爾蘭文" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Protoestrela" title="Protoestrela – 加里西亞文" lang="gl" hreflang="gl" data-title="Protoestrela" data-language-autonym="Galego" data-language-local-name="加里西亞文" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A7%D7%93%D7%9D-%D7%9B%D7%95%D7%9B%D7%91" title="קדם-כוכב – 希伯來文" lang="he" hreflang="he" data-title="קדם-כוכב" data-language-autonym="עברית" data-language-local-name="希伯來文" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Protozvijezda" title="Protozvijezda – 克羅埃西亞文" lang="hr" hreflang="hr" data-title="Protozvijezda" data-language-autonym="Hrvatski" data-language-local-name="克羅埃西亞文" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Protocsillag" title="Protocsillag – 匈牙利文" lang="hu" hreflang="hu" data-title="Protocsillag" data-language-autonym="Magyar" data-language-local-name="匈牙利文" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Protobintang" title="Protobintang – 印尼文" lang="id" hreflang="id" data-title="Protobintang" data-language-autonym="Bahasa Indonesia" data-language-local-name="印尼文" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it badge-Q17437798 badge-goodarticle mw-list-item" title="好文"><a href="https://it.wikipedia.org/wiki/Protostella" title="Protostella – 義大利文" lang="it" hreflang="it" data-title="Protostella" data-language-autonym="Italiano" data-language-local-name="義大利文" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%8E%9F%E5%A7%8B%E6%98%9F" title="原始星 – 日文" lang="ja" hreflang="ja" data-title="原始星" data-language-autonym="日本語" data-language-local-name="日文" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Protolintang" title="Protolintang – 爪哇文" lang="jv" hreflang="jv" data-title="Protolintang" data-language-autonym="Jawa" data-language-local-name="爪哇文" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9E%E1%83%A0%E1%83%9D%E1%83%A2%E1%83%9D%E1%83%95%E1%83%90%E1%83%A0%E1%83%A1%E1%83%99%E1%83%95%E1%83%9A%E1%83%90%E1%83%95%E1%83%98" title="პროტოვარსკვლავი – 喬治亞文" lang="ka" hreflang="ka" data-title="პროტოვარსკვლავი" data-language-autonym="ქართული" data-language-local-name="喬治亞文" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%B6%D2%B1%D0%BB%D0%B4%D1%8B%D0%B7" title="Протожұлдыз – 哈薩克文" lang="kk" hreflang="kk" data-title="Протожұлдыз" data-language-autonym="Қазақша" data-language-local-name="哈薩克文" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9B%90%EC%8B%9C%EB%B3%84" title="원시별 – 韓文" lang="ko" hreflang="ko" data-title="원시별" data-language-autonym="한국어" data-language-local-name="韓文" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Pro%C5%BEvaig%C5%BEd%C4%97" title="Prožvaigždė – 立陶宛文" lang="lt" hreflang="lt" data-title="Prožvaigždė" data-language-autonym="Lietuvių" data-language-local-name="立陶宛文" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D1%95%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Протоѕвезда – 馬其頓文" lang="mk" hreflang="mk" data-title="Протоѕвезда" data-language-autonym="Македонски" data-language-local-name="馬其頓文" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A5%8B%E0%A4%9F%E0%A5%8B%E0%A4%B8%E0%A5%8D%E0%A4%9F%E0%A4%BE%E0%A4%B0" title="प्रोटोस्टार – 馬拉地文" lang="mr" hreflang="mr" data-title="प्रोटोस्टार" data-language-autonym="मराठी" data-language-local-name="馬拉地文" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Protobintang" title="Protobintang – 馬來文" lang="ms" hreflang="ms" data-title="Protobintang" data-language-autonym="Bahasa Melayu" data-language-local-name="馬來文" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%80%E1%80%BC%E1%80%9A%E1%80%BA%E1%80%95%E1%80%B1%E1%80%AB%E1%80%80%E1%80%BA%E1%80%85" title="ကြယ်ပေါက်စ – 緬甸文" lang="my" hreflang="my" data-title="ကြယ်ပေါက်စ" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="緬甸文" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Protoster" title="Protoster – 荷蘭文" lang="nl" hreflang="nl" data-title="Protoster" data-language-autonym="Nederlands" data-language-local-name="荷蘭文" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Protostjerne" title="Protostjerne – 耐諾斯克挪威文" lang="nn" hreflang="nn" data-title="Protostjerne" data-language-autonym="Norsk nynorsk" data-language-local-name="耐諾斯克挪威文" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Protostjerne" title="Protostjerne – 巴克摩挪威文" lang="nb" hreflang="nb" data-title="Protostjerne" data-language-autonym="Norsk bokmål" data-language-local-name="巴克摩挪威文" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Protogwiazda" title="Protogwiazda – 波蘭文" lang="pl" hreflang="pl" data-title="Protogwiazda" data-language-autonym="Polski" data-language-local-name="波蘭文" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Protoestrela" title="Protoestrela – 葡萄牙文" lang="pt" hreflang="pt" data-title="Protoestrela" data-language-autonym="Português" data-language-local-name="葡萄牙文" 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/Protostea" title="Protostea – 羅馬尼亞文" lang="ro" hreflang="ro" data-title="Protostea" data-language-autonym="Română" data-language-local-name="羅馬尼亞文" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru badge-Q17437798 badge-goodarticle mw-list-item" title="好文"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%B7%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Протозвезда – 俄文" lang="ru" hreflang="ru" data-title="Протозвезда" data-language-autonym="Русский" data-language-local-name="俄文" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Protozvezda" title="Protozvezda – 塞爾維亞克羅埃西亞文" lang="sh" hreflang="sh" data-title="Protozvezda" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="塞爾維亞克羅埃西亞文" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Protostar" title="Protostar – Simple English" lang="en-simple" hreflang="en-simple" data-title="Protostar" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Protohviezda" title="Protohviezda – 斯洛伐克文" lang="sk" hreflang="sk" data-title="Protohviezda" data-language-autonym="Slovenčina" data-language-local-name="斯洛伐克文" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%B7%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Протозвезда – 塞爾維亞文" lang="sr" hreflang="sr" data-title="Протозвезда" data-language-autonym="Српски / srpski" data-language-local-name="塞爾維亞文" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Protostj%C3%A4rna" title="Protostjärna – 瑞典文" lang="sv" hreflang="sv" data-title="Protostjärna" data-language-autonym="Svenska" data-language-local-name="瑞典文" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AF%81%E0%AE%95%E0%AE%BF%E0%AE%B4%E0%AF%8D_%E0%AE%AE%E0%AF%80%E0%AE%A9%E0%AF%8D" title="முகிழ் மீன் – 坦米爾文" lang="ta" hreflang="ta" data-title="முகிழ் மீன்" data-language-autonym="தமிழ்" data-language-local-name="坦米爾文" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%94%E0%B8%B2%E0%B8%A7%E0%B8%A4%E0%B8%81%E0%B8%A9%E0%B9%8C%E0%B8%81%E0%B9%88%E0%B8%AD%E0%B8%99%E0%B9%80%E0%B8%81%E0%B8%B4%E0%B8%94" title="ดาวฤกษ์ก่อนเกิด – 泰文" lang="th" hreflang="th" data-title="ดาวฤกษ์ก่อนเกิด" data-language-autonym="ไทย" data-language-local-name="泰文" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/%C3%96ny%C4%B1ld%C4%B1z" title="Önyıldız – 土耳其文" lang="tr" hreflang="tr" data-title="Önyıldız" data-language-autonym="Türkçe" data-language-local-name="土耳其文" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%B9%D0%BE%D0%BB%D0%B4%D1%8B%D0%B7" title="Протойолдыз – 韃靼文" lang="tt" hreflang="tt" data-title="Протойолдыз" data-language-autonym="Татарча / tatarça" data-language-local-name="韃靼文" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk badge-Q17437798 badge-goodarticle mw-list-item" title="好文"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%B7%D0%BE%D1%80%D1%8F" title="Протозоря – 烏克蘭文" lang="uk" hreflang="uk" data-title="Протозоря" data-language-autonym="Українська" data-language-local-name="烏克蘭文" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Protoyulduz" title="Protoyulduz – 烏茲別克文" lang="uz" hreflang="uz" data-title="Protoyulduz" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="烏茲別克文" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ti%E1%BB%81n_sao" title="Tiền sao – 越南文" lang="vi" hreflang="vi" data-title="Tiền sao" data-language-autonym="Tiếng Việt" data-language-local-name="越南文" 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%8E%9F%E6%81%92%E6%98%9F" title="原恒星 – 吳語" lang="wuu" hreflang="wuu" data-title="原恒星" data-language-autonym="吴语" data-language-local-name="吳語" 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%8E%9F%E6%81%86%E6%98%9F" title="原恆星 – 中文" lang="zh" hreflang="zh" data-title="原恆星" data-language-autonym="中文" data-language-local-name="中文" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q204903#sitelinks-wikipedia" title="改跨語言拎" class="wbc-editpage">改拎</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="空間名"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E5%8E%9F%E6%81%86%E6%98%9F" title="睇吓內容頁[c]" accesskey="c"><span>文章</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Talk:%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&redlink=1" rel="discussion" class="new" title="關於內容頁嘅討論 (無呢版)[t]" accesskey="t"><span>討論</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="改語言變體" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">粵語</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="外觀"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E5%8E%9F%E6%81%86%E6%98%9F"><span>閱</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit" title="改呢版嘅代碼[e]" accesskey="e"><span>改</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=history" title="呢一頁之前嘅修訂[h]" accesskey="h"><span>睇返紀錄</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="頁面工具"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="架撐" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">架撐</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">架撐</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">移去側欄</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">收埋</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="多啲選項" > <div class="vector-menu-heading"> 動作 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/%E5%8E%9F%E6%81%86%E6%98%9F"><span>閱</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit" title="改呢版嘅代碼[e]" accesskey="e"><span>改</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=history"><span>睇返紀錄</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> 基本 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:%E9%82%8A%E5%BA%A6%E9%8F%88%E5%8E%BB%E5%91%A2%E7%89%88/%E5%8E%9F%E6%81%86%E6%98%9F" title="列出所有連接過嚟呢度嘅頁面[j]" accesskey="j"><span>有乜連過嚟</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:%E5%A4%96%E9%8F%88%E4%BF%AE%E6%94%B9/%E5%8E%9F%E6%81%86%E6%98%9F" rel="nofollow" title="由呢版連出去嘅版嘅最近修改[k]" accesskey="k"><span>連結頁嘅更改</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Project:%E4%B8%8A%E8%BC%89" title="上載檔案[u]" accesskey="u"><span>上載檔案</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:%E5%B0%88%E9%96%80%E7%89%88" title="所有專門版一覽[q]" accesskey="q"><span>專門版</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&oldid=1028146" title="呢版呢個修訂嘅永久網址"><span>固定連結</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=info" title="多啲同呢版有拏褦嘅資料"><span>此版明細</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:%E5%BC%95%E7%94%A8&page=%E5%8E%9F%E6%81%86%E6%98%9F&id=1028146&wpFormIdentifier=titleform" title="點樣引用呢頁嘅資訊"><span>引用呢篇文</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:UrlShortener&url=https%3A%2F%2Fzh-yue.wikipedia.org%2Fwiki%2F%25E5%258E%259F%25E6%2581%2586%25E6%2598%259F"><span>攞短網址</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fzh-yue.wikipedia.org%2Fwiki%2F%25E5%258E%259F%25E6%2581%2586%25E6%2598%259F"><span>下載QR code</span></a></li> </ul> </div> </div> <div id="p-electronpdfservice-sidebar-portlet-heading" class="vector-menu mw-portlet mw-portlet-electronpdfservice-sidebar-portlet-heading" > <div class="vector-menu-heading"> 打印/匯出 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="electron-print_pdf" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=%E5%8E%9F%E6%81%86%E6%98%9F&action=show-download-screen"><span>下載PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="javascript:print();" rel="alternate" title="呢一版印得嘅版本[p]" accesskey="p"><span>印得嘅版本</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> 第啲維基項目 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Protostars" hreflang="en"><span>維基同享</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q204903" title="連到接住資料儲存庫嘅項目[g]" accesskey="g"><span>維基數據項</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="頁面工具"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="閱讀設定"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">閱讀設定</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">移去側欄</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">收埋</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出自維基百科，自由嘅百科全書</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="yue" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r2009783">.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 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.mbox-text-span{margin-left:23px!important}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}</style><table class="box-translation plainlinks metadata ambox ambox-style" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Translation_to_zh_arrow.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/Translation_to_zh_arrow.svg/50px-Translation_to_zh_arrow.svg.png" decoding="async" width="50" height="17" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/Translation_to_zh_arrow.svg/75px-Translation_to_zh_arrow.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/da/Translation_to_zh_arrow.svg/100px-Translation_to_zh_arrow.svg.png 2x" data-file-width="60" data-file-height="20" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">呢篇文或者呢段要 <a href="/wiki/Wikipedia:%E7%BF%BB%E8%AD%AF%E8%AB%8B%E6%B1%82" title="Wikipedia:翻譯請求">翻譯</a>（或者由 <a href="https://zh.wikipedia.org/wiki/%E5%8E%9F%E6%81%86%E6%98%9F" class="extiw" title="zh:原恆星">zh:原恆星</a>加料）。<span class="hide-when-compact"> 請<span class="plainlinks"><a class="external text" href="https://zh-yue.wikipedia.org/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit">譯</a></span>佢。<br /> 上次編輯：2016年7月30號 10:26。<small>(<a href="/wiki/Wikipedia:%E7%BF%BB%E8%AD%AF" title="Wikipedia:翻譯">翻譯指引</a>)</small></span></div></td></tr></tbody></table> <p><b>原恆星</b>係喺<a href="/w/index.php?title=%E6%98%9F%E9%9A%9B%E4%BB%8B%E8%B3%AA&action=edit&redlink=1" class="new" title="星際介質 (無呢版)">星際介質</a>中嘅<a href="/wiki/%E5%88%86%E5%AD%90%E9%9B%B2#巨分子雲" title="分子雲">巨分子雲</a>收縮下出現嘅<a href="/wiki/%E5%A4%A9%E9%AB%94" title="天體">天體</a>，係恆星形成過程中嘅早期階段。對一個太陽質量嘅恆星嚟講，呢個階段至少持續大概十萬年。佢始於分子雲核心嘅密度增加，以<a href="/w/index.php?title=%E9%87%91%E7%89%9BT%E6%98%9F&action=edit&redlink=1" class="new" title="金牛T星 (無呢版)">金牛T星</a>嘅形成結束，然後就發展進入<a href="/w/index.php?title=%E4%B8%BB%E5%BA%8F%E5%B8%B6&action=edit&redlink=1" class="new" title="主序帶 (無呢版)">主序帶</a>。呢個階段由<a href="/w/index.php?title=%E9%87%91%E7%89%9BT%E9%A2%A8&action=edit&redlink=1" class="new" title="金牛T風 (無呢版)">金牛T風</a>－一種<a href="/w/index.php?title=%E6%81%86%E6%98%9F%E9%A2%A8&action=edit&redlink=1" class="new" title="恆星風 (無呢版)">恆星風</a>嘅開始宣告結束，標誌著恆星從質量嘅吸積進入能量嘅輻射。 </p><p>觀測顯示巨型分子雲總體上近似喺<a href="/w/index.php?title=%E7%B6%AD%E9%87%8C%E5%AE%9A%E7%90%86&action=edit&redlink=1" class="new" title="維里定理 (無呢版)">維里平衡</a>嘅狀態，星雲中嘅<a href="/w/index.php?title=%E9%87%8D%E5%8A%9B%E6%9D%9F%E7%B8%9B%E8%83%BD&action=edit&redlink=1" class="new" title="重力束縛能 (無呢版)">重力束縛能</a>被星雲中構成<a href="/wiki/%E5%88%86%E5%AD%90" title="分子">分子</a>嘅<a href="/wiki/%E5%8B%95%E8%83%BD" title="動能">動能</a>平衡。任何對雲氣嘅干擾都可能擾亂佢嘅平衡狀態，干擾嘅例子可以係嚟自<a href="/wiki/%E8%B6%85%E6%96%B0%E6%98%9F" title="超新星">超新星</a>嘅震波；星系內旋臂嘅<a href="/w/index.php?title=%E5%AF%86%E5%BA%A6%E6%B3%A2&action=edit&redlink=1" class="new" title="密度波 (無呢版)">密度波</a>，或者係同第二啲雲氣嘅接近或碰撞。無論擾動嘅來源係邊一種，只要夠大就可能喺雲氣內嘅特定地區造成重力大過熱動能嘅重力變化。 </p><p>英國物理學家<a href="/w/index.php?title=%E8%A9%B9%E5%A7%86%E5%A3%AB%C2%B7%E9%87%91%E6%96%AF&action=edit&redlink=1" class="new" title="詹姆士·金斯 (無呢版)">詹姆士·金斯</a>曾經詳細討論過上述嘅現象。佢顯示到，喺適當嘅情況下，一團雲氣或其中嘅一部分，將開如上述嘅收縮。佢導出咗一條公式可以計算雲氣所需嘅大細同質量，以及喺<a href="/w/index.php?title=%E9%87%8D%E5%8A%9B%E6%94%B6%E7%B8%AE&action=edit&redlink=1" class="new" title="重力收縮 (無呢版)">重力收縮</a>開始前嘅<a href="/wiki/%E6%BA%AB%E5%BA%A6" title="溫度">溫度</a>同<a href="/wiki/%E5%AF%86%E5%BA%A6" title="密度">密度</a>。呢個臨界質量就係所知嘅<a href="/w/index.php?title=%E9%87%91%E6%96%AF%E4%B8%8D%E7%A9%A9%E5%AE%9A%E6%80%A7&action=edit&redlink=1" class="new" title="金斯不穩定性 (無呢版)">金斯質量</a>，可以由下式得到： </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle M_{j}={\frac {9}{4}}\times \left({\frac {1}{2\pi n}}\right)^{\frac {1}{2}}\times {\frac {1}{m^{2}}}\times \left({\frac {kT}{G}}\right)^{\frac {3}{2}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>M</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>j</mi> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>9</mn> <mn>4</mn> </mfrac> </mrow> <mo>×</mo> <msup> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>2</mn> <mi>π</mi> <mi>n</mi> </mrow> </mfrac> </mrow> <mo>)</mo> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> </msup> <mo>×</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msup> <mi>m</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mfrac> </mrow> <mo>×</mo> <msup> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>k</mi> <mi>T</mi> </mrow> <mi>G</mi> </mfrac> </mrow> <mo>)</mo> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>3</mn> <mn>2</mn> </mfrac> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle M_{j}={\frac {9}{4}}\times \left({\frac {1}{2\pi n}}\right)^{\frac {1}{2}}\times {\frac {1}{m^{2}}}\times \left({\frac {kT}{G}}\right)^{\frac {3}{2}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/dbf047d0c5522916ec17ded0d1d509cd48d6d8b2" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:39.436ex; height:7.343ex;" alt="{\displaystyle M_{j}={\frac {9}{4}}\times \left({\frac {1}{2\pi n}}\right)^{\frac {1}{2}}\times {\frac {1}{m^{2}}}\times \left({\frac {kT}{G}}\right)^{\frac {3}{2}}}"></span></dd></dl> <p><i>n</i>係特定區域的密度，<i>m</i>係喺雲氣內氣體平均嘅質量，而<i>T</i>係氣體嘅溫度。 </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="碎裂"><span id=".E7.A2.8E.E8.A3.82"></span>碎裂</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&section=1" title="編輯小節: 碎裂"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>恆星經常被發現係成群嘅，而且睇似係同一個時間形成嘅，亦即係所知嘅星團。噉可以被解釋為當雲氣收縮時佢嘅密度係唔均勻嘅。事實上，第一個指出呢一點嘅係<a href="/w/index.php?title=%E7%90%86%E5%AF%9F%C2%B7%E6%8B%89%E6%A3%AE&action=edit&redlink=1" class="new" title="理察·拉森 (無呢版)">理察·拉森</a>，當恆星喺<a href="/wiki/%E5%88%86%E5%AD%90%E9%9B%B2#巨分子雲" title="分子雲">巨分子雲</a>內形成時，可以全面嘅觀察到喺雲氣內所有尺度上嘅<a href="/wiki/%E6%B9%8D%E6%B5%81" class="mw-redirect" title="湍流">湍流</a>速度都增加咗。呢啲湍流嘅速度壓縮氣體產生<a href="/w/index.php?title=%E9%9C%87%E6%B3%A2&action=edit&redlink=1" class="new" title="震波 (無呢版)">震波</a>，通常會喺巨分子雲尺度同密度嘅廣大範圍內引發絲狀同埋團塊嘅結構。呢個過程被稱為<a href="/w/index.php?title=%E6%B9%8D%E6%B5%81%E7%A2%8E%E8%A3%82&action=edit&redlink=1" class="new" title="湍流碎裂 (無呢版)">湍流碎裂</a>。一啲團塊結構超過咗<a href="/w/index.php?title=%E9%87%91%E6%96%AF%E4%B8%8D%E7%A9%A9%E5%AE%9A%E6%80%A7&action=edit&redlink=1" class="new" title="金斯不穩定性 (無呢版)">金斯質量</a>並且重心變得唔穩定，可能會被分顆成單一或多星嘅係統。 </p><p>無論原因係點，雲氣因碎裂而變得較細，密度較高嘅區域可能會持續再成為更細嘅區域，結果係成為原恆團。噉同星團係普遍存在嘅觀測現象一致。 </p> <div class="mw-heading mw-heading2"><h2 id="來自重力能量嘅加熱"><span id=".E4.BE.86.E8.87.AA.E9.87.8D.E5.8A.9B.E8.83.BD.E9.87.8F.E5.98.85.E5.8A.A0.E7.86.B1"></span>來自重力能量嘅加熱</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&section=2" title="編輯小節: 來自重力能量嘅加熱"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>當雲氣繼續收縮時，佢嘅溫度會增加。呢個唔係核反應造成嘅，只係<a href="/w/index.php?title=%E9%87%8D%E5%8A%9B%E6%9D%9F%E7%B8%9B%E8%83%BD&action=edit&redlink=1" class="new" title="重力束縛能 (無呢版)">重力能量</a>轉換成嘅熱動能。當微粒（原子或分子）因為喺收縮嘅碎片中而減少至質量中心嘅距離時，就會導致重力能量減少。但係因為總能量嘅守恆，因此隨著重力能量嘅減少，微粒嘅動能亦相對地增加。熱動能嘅增加會令雲氣溫度上升，雲氣越收縮溫度就增加得越多。 </p><p>分子間嘅碰撞經常亦可以令佢哋成為激發狀態，然後經由<a href="/wiki/%E8%BC%BB%E5%B0%84" title="輻射">輻射</a>嘅發射衰變狀態。呢啲輻射都有特定頻率，喺呢啲溫度（10至20<a href="/wiki/%E7%86%B1%E5%8A%9B%E5%AD%B8%E6%BA%AB%E6%A8%99" class="mw-redirect" title="熱力學溫標">K</a>）發射嘅輻射係光譜中嘅<a href="/wiki/%E5%BE%AE%E6%B3%A2" title="微波">微波</a>或<a href="/wiki/%E7%B4%85%E5%A4%96%E7%B7%9A" class="mw-redirect" title="紅外線">紅外線</a>。呢啲輻射大部分都會由雲氣中逃出，因此能夠防止溫度快速上升。 </p><p>當雲氣收縮時，分子嘅數值密度會增加，噉最終會令散發嘅輻射越嚟越難走得甩。實際上，氣體對呢啲輻射會變得唔透明，並且雲氣內嘅溫度將開始更快速上升。 </p><p>雲氣喺紅外線變得唔透明嘅事實，也使我哋難以直接觀測到雲氣內發生嘅變化。我哋必須使用波長更長嘅<a href="/wiki/%E7%84%A1%E7%B7%9A%E9%9B%BB" title="無線電">無線電</a>觀察還能逃逸出來嘅輻射。另外，理論同埋計算機嘅數值模擬亦係了解呢個階段所必須嘅。 </p><p>直到周圍嘅物體落入中心嘅凝塊，原恆星嘅階段先算係開始。而當周圍嘅氣體同塵粒都已經消散，吸積嘅過程亦都停止，呢粒原恆星至會被考慮係<a href="/w/index.php?title=%E5%89%8D%E4%B8%BB%E5%BA%8F%E6%98%9F&action=edit&redlink=1" class="new" title="前主序星 (無呢版)">前主序星</a>。 </p> <div class="mw-heading mw-heading2"><h2 id="歷史"><span id=".E6.AD.B7.E5.8F.B2"></span>歷史</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&section=3" title="編輯小節: 歷史"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>「原恆星」呢個詞係喺1889年嘅出版物首次出現嘅。 </p> <dl><dd>" protostar acquiring two condensations will become a binary and be stable thereafter [..] Whether a binary or a single star results depends largely on the total angular momentum of the protostar"</dd> <dd>"原恆星獲得兩個濃縮體將發展成為聯星並且係穩定嘅[..]個結果係聯星或單獨嘅恆星，取決於原恆星嘅總角動量。"<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></dd></dl> <div class="mw-heading mw-heading2"><h2 id="註"><span id=".E8.A8.BB"></span>註</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&section=4" title="編輯小節: 註"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <div style="font-size: 95%"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><i>Astronomical Society of the Pacific</i> (1889) <a rel="nofollow" class="external text" href="http://books.google.com/books?vid=0dAua9PID1xbsOEv44&id=WLsOAAAAIAAJ&q=protostar+date:0-1890&dq=protostar+date:0-1890&num=50&pgis=1">page 388</a></span> </li> </ol> </div> <div class="mw-heading mw-heading2"><h2 id="睇埋"><span id=".E7.9D.87.E5.9F.8B"></span>睇埋</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&section=5" title="編輯小節: 睇埋"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/w/index.php?title=%E8%B5%AB%E6%AF%94%E6%A0%BC-%E5%93%88%E7%BE%85%E5%A4%A9%E9%AB%94&action=edit&redlink=1" class="new" title="赫比格-哈羅天體 (無呢版)">赫比格-哈羅天體</a></li> <li><a href="/w/index.php?title=%E4%B8%BB%E5%BA%8F%E5%89%8D%E6%98%9F&action=edit&redlink=1" class="new" title="主序前星 (無呢版)">主序前星</a></li> <li><a href="/w/index.php?title=%E5%8E%9F%E8%A1%8C%E6%98%9F%E7%9B%A4&action=edit&redlink=1" class="new" title="原行星盤 (無呢版)">原行星盤</a></li> <li><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F%E7%9B%A4&action=edit&redlink=1" class="new" title="原恆星盤 (無呢版)">原恆星盤</a></li> <li><a href="/w/index.php?title=NGC_7538&action=edit&redlink=1" class="new" title="NGC 7538 (無呢版)">NGC 7538</a>：經已被發現嘅最大原恆星之家，大概係<a href="/wiki/%E5%A4%AA%E9%99%BD%E7%B3%BB" title="太陽系">太陽系</a>嘅300倍大細。</li></ul> <div class="mw-heading mw-heading2"><h2 id="出面網頁"><span id=".E5.87.BA.E9.9D.A2.E7.B6.B2.E9.A0.81"></span>出面網頁</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%8E%9F%E6%81%86%E6%98%9F&action=edit&section=6" title="編輯小節: 出面網頁"><span>編輯</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.spacedaily.com/reports/Planet_Forming_Disks_Might_Put_Brakes_On_Stars_999.html">Planet-Forming Disks Might Put Brakes On Stars</a> (SpaceDaily) Jul 25, 2006</li> <li><a rel="nofollow" class="external text" href="http://www.theregister.com/2006/07/27/planets_brake/">Planets could put the brakes on young stars</a> Lucy Sherriff (The Register) Thursday 27th July 2006 13:02 GMT</li> <li><a rel="nofollow" class="external text" href="http://www.space.com/scienceastronomy/060724_star_spin.html">Why Fast-Spinning Young Stars Don't Fly Apart</a> (SPACE.com) 24 July 2006 03:10 pm ET</li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">由「<a dir="ltr" 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