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id="toc-Caratteristiche-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Note" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Note"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Note</span> </div> </a> <ul id="toc-Note-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Altri_progetti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Altri_progetti"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Altri progetti</span> </div> </a> <ul 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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">Mostra/Nascondi l'indice</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">Galassia a spirale</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="Vai a una voce in un'altra lingua. Disponibile in 71 lingue" > <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-71" 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">71 lingue</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/Spiraalsterrestelsel" title="Spiraalsterrestelsel - afrikaans" lang="af" hreflang="af" data-title="Spiraalsterrestelsel" 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/%D9%85%D8%AC%D8%B1%D8%A9_%D8%AD%D9%84%D8%B2%D9%88%D9%86%D9%8A%D8%A9" title="مجرة حلزونية - arabo" lang="ar" hreflang="ar" data-title="مجرة حلزونية" data-language-autonym="العربية" data-language-local-name="arabo" 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/Galaxa_espiral" title="Galaxa espiral - asturiano" lang="ast" hreflang="ast" data-title="Galaxa espiral" data-language-autonym="Asturianu" data-language-local-name="asturiano" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%A8%D9%88%D8%B1%D9%88%D8%B4%D9%88%D9%82_%D9%82%D8%A7%D9%84%D8%A7%DA%A9%D8%B3%DB%8C" title="بوروشوق قالاکسی - South Azerbaijani" lang="azb" hreflang="azb" data-title="بوروشوق قالاکسی" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A1%D0%BF%D1%96%D1%80%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%82%D1%8B%D0%BA%D0%B0" title="Спіральная галактыка - bielorusso" lang="be" hreflang="be" data-title="Спіральная галактыка" data-language-autonym="Беларуская" data-language-local-name="bielorusso" 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%A1%D0%BF%D0%B8%D1%80%D0%B0%D0%BB%D0%BD%D0%B0_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%82%D0%B8%D0%BA%D0%B0" title="Спирална галактика - bulgaro" lang="bg" hreflang="bg" data-title="Спирална галактика" data-language-autonym="Български" data-language-local-name="bulgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bjn mw-list-item"><a href="https://bjn.wikipedia.org/wiki/Galaksi_spiral" title="Galaksi spiral - banjar" lang="bjn" hreflang="bjn" data-title="Galaksi spiral" data-language-autonym="Banjar" data-language-local-name="banjar" class="interlanguage-link-target"><span>Banjar</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A6%B0%E0%A7%8D%E0%A6%AA%E0%A6%BF%E0%A6%B2_%E0%A6%9B%E0%A6%BE%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%AA%E0%A6%A5" title="সর্পিল ছায়াপথ - bengalese" lang="bn" hreflang="bn" data-title="সর্পিল ছায়াপথ" data-language-autonym="বাংলা" data-language-local-name="bengalese" 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/Spiralna_galaksija" title="Spiralna galaksija - bosniaco" lang="bs" hreflang="bs" data-title="Spiralna galaksija" data-language-autonym="Bosanski" data-language-local-name="bosniaco" 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/Gal%C3%A0xia_espiral" title="Galàxia espiral - catalano" lang="ca" hreflang="ca" data-title="Galàxia espiral" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%AF%DB%95%D9%84%DB%95%D8%B3%D8%AA%DB%8E%D8%B1%DB%95%DB%8C_%D9%84%D9%88%D9%88%D9%84%D9%BE%DB%8E%DA%86" title="گەلەستێرەی لوولپێچ - curdo centrale" lang="ckb" hreflang="ckb" data-title="گەلەستێرەی لوولپێچ" data-language-autonym="کوردی" data-language-local-name="curdo centrale" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-co mw-list-item"><a href="https://co.wikipedia.org/wiki/Galassia_spirali" title="Galassia spirali - corso" lang="co" hreflang="co" data-title="Galassia spirali" data-language-autonym="Corsu" data-language-local-name="corso" class="interlanguage-link-target"><span>Corsu</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Spir%C3%A1ln%C3%AD_galaxie" title="Spirální galaxie - ceco" lang="cs" hreflang="cs" data-title="Spirální galaxie" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Galaeth_droellog" title="Galaeth droellog - gallese" lang="cy" hreflang="cy" data-title="Galaeth droellog" data-language-autonym="Cymraeg" data-language-local-name="gallese" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Spiralgalaxie" title="Spiralgalaxie - tedesco" lang="de" hreflang="de" data-title="Spiralgalaxie" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/Galaksiya_vaw%C4%B1yayiye" title="Galaksiya vawıyayiye - Zazaki" lang="diq" hreflang="diq" data-title="Galaksiya vawıyayiye" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A3%CF%80%CE%B5%CE%B9%CF%81%CE%BF%CE%B5%CE%B9%CE%B4%CE%AE%CF%82_%CE%B3%CE%B1%CE%BB%CE%B1%CE%BE%CE%AF%CE%B1%CF%82" title="Σπειροειδής γαλαξίας - greco" lang="el" hreflang="el" data-title="Σπειροειδής γαλαξίας" data-language-autonym="Ελληνικά" data-language-local-name="greco" 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/Spiral_galaxy" title="Spiral galaxy - inglese" lang="en" hreflang="en" data-title="Spiral galaxy" data-language-autonym="English" data-language-local-name="inglese" 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/Spirala_galaksio" title="Spirala galaksio - esperanto" lang="eo" hreflang="eo" data-title="Spirala galaksio" data-language-autonym="Esperanto" data-language-local-name="esperanto" 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/Galaxia_espiral" title="Galaxia espiral - spagnolo" lang="es" hreflang="es" data-title="Galaxia espiral" data-language-autonym="Español" data-language-local-name="spagnolo" 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/Spiraalgalaktika" title="Spiraalgalaktika - estone" lang="et" hreflang="et" data-title="Spiraalgalaktika" data-language-autonym="Eesti" data-language-local-name="estone" 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/Galaxia_espiral" title="Galaxia espiral - basco" lang="eu" hreflang="eu" data-title="Galaxia espiral" data-language-autonym="Euskara" data-language-local-name="basco" 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/%DA%A9%D9%87%DA%A9%D8%B4%D8%A7%D9%86_%D9%85%D8%A7%D8%B1%D9%BE%DB%8C%DA%86%DB%8C" title="کهکشان مارپیچی - persiano" lang="fa" hreflang="fa" data-title="کهکشان مارپیچی" data-language-autonym="فارسی" data-language-local-name="persiano" 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/Kierteisgalaksi" title="Kierteisgalaksi - finlandese" lang="fi" hreflang="fi" data-title="Kierteisgalaksi" data-language-autonym="Suomi" data-language-local-name="finlandese" 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/Galaxie_spirale" title="Galaxie spirale - francese" lang="fr" hreflang="fr" data-title="Galaxie spirale" data-language-autonym="Français" data-language-local-name="francese" 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/R%C3%A9altra_b%C3%ADseach" title="Réaltra bíseach - irlandese" lang="ga" hreflang="ga" data-title="Réaltra bíseach" data-language-autonym="Gaeilge" data-language-local-name="irlandese" 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/Galaxia_espiral" title="Galaxia espiral - galiziano" lang="gl" hreflang="gl" data-title="Galaxia espiral" data-language-autonym="Galego" data-language-local-name="galiziano" 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%92%D7%9C%D7%A7%D7%A1%D7%99%D7%94_%D7%A1%D7%A4%D7%99%D7%A8%D7%9C%D7%99%D7%AA" title="גלקסיה ספירלית - ebraico" lang="he" hreflang="he" data-title="גלקסיה ספירלית" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A4%B0%E0%A5%8D%E0%A4%AA%E0%A4%BF%E0%A4%B2_%E0%A4%97%E0%A5%88%E0%A4%B2%E0%A5%87%E0%A4%95%E0%A5%8D%E0%A4%B8%E0%A5%80" title="सर्पिल गैलेक्सी - hindi" lang="hi" hreflang="hi" data-title="सर्पिल गैलेक्सी" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Spiralna_galaktika" title="Spiralna galaktika - croato" lang="hr" hreflang="hr" data-title="Spiralna galaktika" data-language-autonym="Hrvatski" data-language-local-name="croato" 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/Spir%C3%A1lgalaxis" title="Spirálgalaxis - ungherese" lang="hu" hreflang="hu" data-title="Spirálgalaxis" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8A%D5%A1%D6%80%D5%B8%D6%82%D6%80%D5%A1%D5%B1%D6%87_%D5%A3%D5%A1%D5%AC%D5%A1%D5%AF%D5%BF%D5%AB%D5%AF%D5%A1" title="Պարուրաձև գալակտիկա - armeno" lang="hy" hreflang="hy" data-title="Պարուրաձև գալակտիկա" data-language-autonym="Հայերեն" data-language-local-name="armeno" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Galaksi_spiral" title="Galaksi spiral - indonesiano" lang="id" hreflang="id" data-title="Galaksi spiral" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E6%B8%A6%E5%B7%BB%E9%8A%80%E6%B2%B3" title="渦巻銀河 - giapponese" lang="ja" hreflang="ja" data-title="渦巻銀河" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B8%D1%80%D0%B0%D0%BB%D1%8C%D0%B4%D1%8B_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%82%D0%B8%D0%BA%D0%B0" title="Спиральды галактика - kazako" lang="kk" hreflang="kk" data-title="Спиральды галактика" data-language-autonym="Қазақша" data-language-local-name="kazako" 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/%EB%82%98%EC%84%A0%EC%9D%80%ED%95%98" title="나선은하 - coreano" lang="ko" hreflang="ko" data-title="나선은하" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Spiralgalaxie" title="Spiralgalaxie - lussemburghese" lang="lb" hreflang="lb" data-title="Spiralgalaxie" data-language-autonym="Lëtzebuergesch" data-language-local-name="lussemburghese" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Spiralin%C4%97_galaktika" title="Spiralinė galaktika - lituano" lang="lt" hreflang="lt" data-title="Spiralinė galaktika" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Spir%C4%81lveida_galaktika" title="Spirālveida galaktika - lettone" lang="lv" hreflang="lv" data-title="Spirālveida galaktika" data-language-autonym="Latviešu" data-language-local-name="lettone" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B8%D1%80%D0%B0%D0%BB%D0%BD%D0%B0_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%81%D0%B8%D1%98%D0%B0" title="Спирална галаксија - macedone" lang="mk" hreflang="mk" data-title="Спирална галаксија" data-language-autonym="Македонски" data-language-local-name="macedone" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%9C%D1%83%D1%88%D0%B3%D0%B8%D0%B0_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%82%D0%B8%D0%BA" title="Мушгиа галактик - mongolo" lang="mn" hreflang="mn" data-title="Мушгиа галактик" data-language-autonym="Монгол" data-language-local-name="mongolo" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%B8%E0%A4%B0%E0%A5%8D%E0%A4%AA%E0%A4%BF%E0%A4%B2%E0%A4%BE%E0%A4%95%E0%A4%BE%E0%A4%B0_%E0%A4%A6%E0%A5%80%E0%A4%B0%E0%A5%8D%E0%A4%98%E0%A4%BF%E0%A4%95%E0%A4%BE" title="सर्पिलाकार दीर्घिका - marathi" lang="mr" hreflang="mr" data-title="सर्पिलाकार दीर्घिका" data-language-autonym="मराठी" data-language-local-name="marathi" 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/Galaksi_pilin" title="Galaksi pilin - malese" lang="ms" hreflang="ms" data-title="Galaksi pilin" data-language-autonym="Bahasa Melayu" data-language-local-name="malese" 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%81%E1%80%9B%E1%80%AF%E1%80%95%E1%80%90%E1%80%BA%E1%80%95%E1%80%AF%E1%80%B6%E1%80%85%E1%80%B6_%E1%80%82%E1%80%9C%E1%80%80%E1%80%BA%E1%80%86%E1%80%AE" title="ခရုပတ်ပုံစံ ဂလက်ဆီ - birmano" lang="my" hreflang="my" data-title="ခရုပတ်ပုံစံ ဂလက်ဆီ" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="birmano" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-mzn mw-list-item"><a href="https://mzn.wikipedia.org/wiki/%D9%85%D8%B1%D9%BE%DB%8C%DA%86%DB%8C_%DA%A9%D9%87%DA%A9%D8%B4%D9%88%D9%86" title="مرپیچی کهکشون - mazandarani" lang="mzn" hreflang="mzn" data-title="مرپیچی کهکشون" data-language-autonym="مازِرونی" data-language-local-name="mazandarani" class="interlanguage-link-target"><span>مازِرونی</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%B8%E0%A4%99%E0%A5%8D%E0%A4%96%E0%A4%BE%E0%A4%95%E0%A4%BE%E0%A4%B0_%E0%A4%A4%E0%A4%BE%E0%A4%B0%E0%A4%BE%E0%A4%AA%E0%A5%81%E0%A4%9E%E0%A5%8D%E0%A4%9C" title="सङ्खाकार तारापुञ्ज - nepalese" lang="ne" hreflang="ne" data-title="सङ्खाकार तारापुञ्ज" data-language-autonym="नेपाली" data-language-local-name="nepalese" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Spiraalvormig_sterrenstelsel" title="Spiraalvormig sterrenstelsel - olandese" lang="nl" hreflang="nl" data-title="Spiraalvormig sterrenstelsel" data-language-autonym="Nederlands" data-language-local-name="olandese" 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/Spiralgalakse" title="Spiralgalakse - norvegese nynorsk" lang="nn" hreflang="nn" data-title="Spiralgalakse" data-language-autonym="Norsk nynorsk" data-language-local-name="norvegese nynorsk" 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/Spiralgalakse" title="Spiralgalakse - norvegese bokmål" lang="nb" hreflang="nb" data-title="Spiralgalakse" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Galaxia_espirala" title="Galaxia espirala - occitano" lang="oc" hreflang="oc" data-title="Galaxia espirala" data-language-autonym="Occitan" data-language-local-name="occitano" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Ruda_margundoo" title="Ruda margundoo - oromo" lang="om" hreflang="om" data-title="Ruda margundoo" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B8%E0%A8%B0%E0%A8%AA%E0%A8%BF%E0%A8%B2_%E0%A8%86%E0%A8%95%E0%A8%BE%E0%A8%B8%E0%A8%BC%E0%A8%97%E0%A9%B0%E0%A8%97%E0%A8%BE" title="ਸਰਪਿਲ ਆਕਾਸ਼ਗੰਗਾ - punjabi" lang="pa" hreflang="pa" data-title="ਸਰਪਿਲ ਆਕਾਸ਼ਗੰਗਾ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Galaktyka_spiralna" title="Galaktyka spiralna - polacco" lang="pl" hreflang="pl" data-title="Galaktyka spiralna" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%DA%86%DA%A9%D8%B1%DB%8C_%D8%AA%D8%A7%D8%B1%DB%81_%D8%B3%D9%85%D9%86%D8%AF%D8%B1" title="چکری تارہ سمندر - Western Punjabi" lang="pnb" hreflang="pnb" data-title="چکری تارہ سمندر" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Gal%C3%A1xia_espiral" title="Galáxia espiral - portoghese" lang="pt" hreflang="pt" data-title="Galáxia espiral" data-language-autonym="Português" data-language-local-name="portoghese" 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/Galaxie_spiral%C4%83" title="Galaxie spirală - rumeno" lang="ro" hreflang="ro" data-title="Galaxie spirală" data-language-autonym="Română" data-language-local-name="rumeno" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B8%D1%80%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%82%D0%B8%D0%BA%D0%B0" title="Спиральная галактика - russo" lang="ru" hreflang="ru" data-title="Спиральная галактика" data-language-autonym="Русский" data-language-local-name="russo" 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/Spiralna_galaksija" title="Spiralna galaksija - serbo-croato" lang="sh" hreflang="sh" data-title="Spiralna galaksija" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbo-croato" 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/Spiral_galaxy" title="Spiral galaxy - Simple English" lang="en-simple" hreflang="en-simple" data-title="Spiral galaxy" 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/%C5%A0pir%C3%A1lov%C3%A1_galaxia" title="Špirálová galaxia - slovacco" lang="sk" hreflang="sk" data-title="Špirálová galaxia" data-language-autonym="Slovenčina" data-language-local-name="slovacco" 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%A1%D0%BF%D0%B8%D1%80%D0%B0%D0%BB%D0%BD%D0%B0_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%81%D0%B8%D1%98%D0%B0" title="Спирална галаксија - serbo" lang="sr" hreflang="sr" data-title="Спирална галаксија" data-language-autonym="Српски / srpski" data-language-local-name="serbo" 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/Spiralgalax" title="Spiralgalax - svedese" lang="sv" hreflang="sv" data-title="Spiralgalax" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</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%A3%E0%B8%B2%E0%B8%88%E0%B8%B1%E0%B8%81%E0%B8%A3%E0%B8%8A%E0%B8%99%E0%B8%B4%E0%B8%94%E0%B8%81%E0%B9%89%E0%B8%99%E0%B8%AB%E0%B8%AD%E0%B8%A2" title="ดาราจักรชนิดก้นหอย - thailandese" lang="th" hreflang="th" data-title="ดาราจักรชนิดก้นหอย" data-language-autonym="ไทย" data-language-local-name="thailandese" 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/Sarmal_galaksi" title="Sarmal galaksi - turco" lang="tr" hreflang="tr" data-title="Sarmal galaksi" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%BF%D1%96%D1%80%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0_%D0%B3%D0%B0%D0%BB%D0%B0%D0%BA%D1%82%D0%B8%D0%BA%D0%B0" title="Спіральна галактика - ucraino" lang="uk" hreflang="uk" data-title="Спіральна галактика" data-language-autonym="Українська" data-language-local-name="ucraino" 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/Thi%C3%AAn_h%C3%A0_xo%E1%BA%AFn_%E1%BB%91c" title="Thiên hà xoắn ốc - vietnamita" lang="vi" hreflang="vi" data-title="Thiên hà xoắn ốc" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" 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/%E6%97%8B%E6%B6%A1%E6%98%9F%E7%B3%BB" title="旋涡星系 - wu" lang="wuu" hreflang="wuu" data-title="旋涡星系" 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-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%A1%E1%83%9E%E1%83%98%E1%83%A0%E1%83%90%E1%83%9A%E1%83%A3%E1%83%A0%E1%83%98_%E1%83%92%E1%83%90%E1%83%9A%E1%83%90%E1%83%A5%E1%83%A2%E1%83%98%E1%83%99%E1%83%90" title="სპირალური გალაქტიკა - mengrelio" lang="xmf" hreflang="xmf" data-title="სპირალური გალაქტიკა" data-language-autonym="მარგალური" data-language-local-name="mengrelio" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%9E%BA%E6%97%8B%E6%98%9F%E7%B3%BB" title="螺旋星系 - cinese" lang="zh" hreflang="zh" data-title="螺旋星系" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/K%C5%84g-l%C3%AA_g%C3%AEn-h%C3%B4" title="Kńg-lê gîn-hô - min nan" lang="nan" hreflang="nan" data-title="Kńg-lê gîn-hô" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="min nan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E8%9E%BA%E6%97%8B%E6%98%9F%E7%B3%BB" title="螺旋星系 - cantonese" lang="yue" hreflang="yue" data-title="螺旋星系" data-language-autonym="粵語" data-language-local-name="cantonese" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div 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typeof="mw:File/Thumb"><a href="/wiki/File:Whirpool_Galaxy.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Whirpool_Galaxy.jpg/220px-Whirpool_Galaxy.jpg" decoding="async" width="220" height="274" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Whirpool_Galaxy.jpg/330px-Whirpool_Galaxy.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Whirpool_Galaxy.jpg/440px-Whirpool_Galaxy.jpg 2x" data-file-width="1645" data-file-height="2050" /></a><figcaption>La <a href="/wiki/M51_(astronomia)" title="M51 (astronomia)">Galassia Vortice</a> (M51) è un tipico esempio di galassia spirale vista "di faccia".</figcaption></figure> <p>Una <b>galassia a spirale</b>, o semplicemente <b>galassia spirale</b>, è un tipo di <a href="/wiki/Galassia" title="Galassia">galassia</a> originariamente descritto nel 1936 da <a href="/wiki/Edwin_Hubble" title="Edwin Hubble">Edwin Hubble</a> nella sua pubblicazione <i>The Realm of the Nebulae</i>,<sup id="cite_ref-Hubble-1936_1-0" class="reference"><a href="#cite_note-Hubble-1936-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> e fa di conseguenza parte della <a href="/wiki/Sequenza_di_Hubble" title="Sequenza di Hubble">sequenza di Hubble</a>. </p><p>Le galassie spirali derivano il loro nome dai brillanti bracci sede di un'attività di <a href="/wiki/Formazione_stellare" title="Formazione stellare">formazione stellare</a> presenti nel <a href="/wiki/Disco_galattico" title="Disco galattico">disco galattico</a>, che si estendono come una <a href="/wiki/Spirale_logaritmica" title="Spirale logaritmica">spirale logaritmica</a> a partire dal bulbo. Questi bracci sono più brillanti del disco circostante per effetto della presenza delle giovani stelle di <a href="/wiki/Classe_spettrale" class="mw-redirect" title="Classe spettrale">classe spettrale</a> OB e distinguono le galassie a spirale da quelle <a href="/wiki/Galassia_lenticolare" title="Galassia lenticolare">lenticolari</a>, il cui disco è privo di bracci. </p><p>Il disco delle galassie spirali è in genere circondato da un grande alone <a href="/wiki/Sferoide" title="Sferoide">sferoidale</a> di stelle di popolazione II, la maggior parte delle quali sono concentrate in <a href="/wiki/Ammasso_globulare" title="Ammasso globulare">ammassi globulari</a> in orbita attorno al centro galattico. </p><p>Circa due terzi delle galassie a spirali possiedono una struttura a forma di barra,<sup id="cite_ref-mihalas1968_2-0" class="reference"><a href="#cite_note-mihalas1968-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> che si estende dal rigonfiamento centrale, nel punto in cui si staccano i bracci di spirale. La proporzione di galassie a spirale barrate è cambiata nel corso della storia dell'universo; 8 miliardi di anni fa, le barrate rappresentavano solo il 10%, sono salite al 25 % due miliardi e mezzo di anni fa e attualmente rappresentano i due terzi del totale delle galassie nell'universo visibile.<sup id="cite_ref-3" class="reference"><a href="#cite_note-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="Struttura">Struttura</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Galassia_a_spirale&veaction=edit&section=1" title="Modifica la sezione Struttura" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Galassia_a_spirale&action=edit&section=1" title="Edit section's source code: Struttura"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La maggior parte delle galassie a spirale presenta le seguenti caratteristiche: </p> <ul><li>consistono di un disco galattico piatto e rotante, che è un agglomerato di stelle giovani di <a href="/wiki/Popolazione_I" class="mw-redirect" title="Popolazione I">popolazione I</a>, <a href="/wiki/Ammasso_aperto" title="Ammasso aperto">ammassi aperti</a> e <a href="/wiki/Nube_molecolare_gigante" title="Nube molecolare gigante">nubi di gas</a> e <a href="/wiki/Mezzo_interstellare" title="Mezzo interstellare">mezzo interstellare</a>;</li> <li>Possiedono un rigonfiamento centrale detto <i><a href="/wiki/Bulge" title="Bulge">bulge</a></i> (o bulbo), assimilabile ad una piccola <a href="/wiki/Galassia_ellittica" title="Galassia ellittica">galassia ellittica</a>, contenente molte stelle vecchie (la cosiddetta <a href="/wiki/Popolazione_II" class="mw-redirect" title="Popolazione II">popolazione II</a>), e spesso un <a href="/wiki/Buco_nero_supermassiccio" title="Buco nero supermassiccio">buco nero supermassiccio</a> al suo centro;</li> <li>sono spesso circondate da un <a href="/wiki/Alone_galattico" title="Alone galattico">alone</a>, molte delle quali sono raggruppate in <a href="/wiki/Ammassi_globulari" class="mw-redirect" title="Ammassi globulari">ammassi globulari</a>;</li> <li>hanno un considerevole <a href="/wiki/Momento_angolare" title="Momento angolare">momento angolare</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Caratteristiche">Caratteristiche</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Galassia_a_spirale&veaction=edit&section=2" title="Modifica la sezione Caratteristiche" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Galassia_a_spirale&action=edit&section=2" title="Edit section's source code: Caratteristiche"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:UGC_12158.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b3/UGC_12158.jpg/220px-UGC_12158.jpg" decoding="async" width="220" height="189" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b3/UGC_12158.jpg/330px-UGC_12158.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b3/UGC_12158.jpg/440px-UGC_12158.jpg 2x" data-file-width="2790" data-file-height="2400" /></a><figcaption><a href="/wiki/UGC_12158" title="UGC 12158">UGC 12158</a>, una <a href="/wiki/Galassia_a_spirale_barrata" title="Galassia a spirale barrata">galassia a spirale barrata</a>.</figcaption></figure> <p>La nostra <a href="/wiki/Via_Lattea" title="Via Lattea">Via Lattea</a> è una <a href="/wiki/Galassia_a_spirale_barrata" title="Galassia a spirale barrata">galassia a spirale barrata</a>, anche se la barra è di difficile osservazione a causa della posizione della Terra nel disco galattico.<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> L'evidenza della barra nel centro galattico viene da molte recenti osservazioni, incluse quelle del <a href="/wiki/Telescopio_spaziale_Spitzer" title="Telescopio spaziale Spitzer">telescopio spaziale Spitzer</a>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Assieme alle <a href="/wiki/Galassia_irregolare" title="Galassia irregolare">galassie irregolari</a>, le galassie a spirale costituiscono circa il 60% delle galassie dell'Universo attuale.<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> Si trovano per lo più nelle regioni a bassa densità e sono invece rare al centro degli <a href="/wiki/Ammassi_galattici" class="mw-redirect" title="Ammassi galattici">ammassi galattici</a>.<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> </p><p>Una peculiare galassia a spirale è la cosiddetta <a href="/wiki/Galassia_cometa" title="Galassia cometa">Galassia cometa</a>, membro dell'ammasso di galassie Abell 2667, scoperta il 2 marzo 2007 dal <a href="/wiki/Telescopio_spaziale_Hubble" title="Telescopio spaziale Hubble">telescopio spaziale Hubble</a>.<sup id="cite_ref-Cortese2007_8-0" class="reference"><a href="#cite_note-Cortese2007-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Si tratta probabilmente di una galassia osservata durante una rapida fase di trasformazione dalla forma a spirale a quella lenticolare.<sup id="cite_ref-Fumagalli2011_9-0" class="reference"><a href="#cite_note-Fumagalli2011-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>Uno studio pubblicato<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> a giugno 2017 effettuato con i telescopi <a href="/wiki/Atacama_Large_Millimeter_Array" title="Atacama Large Millimeter Array">ALMA</a> ed <a href="/wiki/Herschel_Space_Observatory" title="Herschel Space Observatory">Herschel</a> ha evidenziato che le galassie a spirale ruotano più velocemente di quelle ellittiche, con un <a href="/wiki/Momento_angolare" title="Momento angolare">momento angolare</a> cinque volte maggiore di queste ultime. Lo studio si è concentrato sulle quantità dei gas che precipitano verso la regione centrale delle galassie in formazione. Nelle galassie ellittiche questo processo è molto più rapido. Tale processo di formazione viene successivamente bloccato dalle fughe di gas dovute alla esplosione di <a href="/wiki/Supernova" title="Supernova">supernove</a>, dai <a href="/wiki/Vento_stellare" title="Vento stellare">venti stellari</a> sino alle energie che si sprigionano dagli eventuali buchi neri che si formano al loro interno. Il momento angolare iniziale viene così controbilanciato e dissipato. Nelle galassie a spirale il processo di addensamento dei gas nella regione centrale è più lento, in tempi comparabili a quelli dell'Universo; la formazione stellare avviene più lentamente ed il momento angolare iniziale viene in tal modo mantenuto. Tale ricerca ha evidenziato come il differente momento angolare e quindi la differenza di velocità della rotazione delle galassie sia correlata alle caratteristiche insite nelle regioni centrali delle galassie in formazione e non, come in precedenza supposto, ad eventi di fusione.<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> <br /> Uno studio pubblicato nel 2016 ha identificato un tipo particolare di galassia a spirale denominato <a href="/wiki/Galassia_a_spirale_superluminosa" title="Galassia a spirale superluminosa">galassia a spirale superluminosa</a> che si presenta insolitamente di grandi dimensioni, massiccia e luminosa al pari di una <a href="/wiki/Galassia_ellittica" title="Galassia ellittica">galassia ellittica gigante</a> ma con un tasso di <a href="/wiki/Formazione_stellare" title="Formazione stellare">formazione stellare</a> elevato, in media 30 <a href="/wiki/Massa_solare" title="Massa solare">masse solari</a>/anno.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Galassia_a_spirale&veaction=edit&section=3" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Galassia_a_spirale&action=edit&section=3" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-Hubble-1936-1"><a href="#cite_ref-Hubble-1936_1-0"><b>^</b></a> <span class="reference-text"><cite class="citation libro" style="font-style:normal"> <a href="/wiki/Edwin_Hubble" title="Edwin Hubble">E.P. Hubble</a>, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=kgiXdDGLpFUC"><span style="font-style:italic;">The realm of the nebulae</span></a>, Mrs. Hepsa Ely Silliman memorial lectures, 25, New Haven, Yale University Press, 1936, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/9780300025002" title="Speciale:RicercaISBN/9780300025002">9780300025002</a>, <a href="/wiki/Online_Computer_Library_Center" title="Online Computer Library Center">OCLC</a> <a rel="nofollow" class="external text" href="//www.worldcat.org/oclc/611263346">611263346</a>.</cite></span> </li> <li id="cite_note-mihalas1968-2"><a href="#cite_ref-mihalas1968_2-0"><b>^</b></a> <span class="reference-text"><cite class="citation libro" style="font-style:normal"> D. Mihalas, <a rel="nofollow" class="external text" href="https://archive.org/details/galacticastronom0000miha"><span style="font-style:italic;">Galactic Astronomy</span></a>, W. H. Freeman, 1968, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/978-0-7167-0326-6" title="Speciale:RicercaISBN/978-0-7167-0326-6">978-0-7167-0326-6</a>.</cite></span> </li> <li id="cite_note-3"><a href="#cite_ref-3"><b>^</b></a> <span class="reference-text"><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="https://www.sciencedaily.com/releases/2014/01/140116085103.htm"><span style="font-style:italic;">Hubble and Galaxy Zoo Find Bars and Baby Galaxies Don't Mix</span></a>, su <span style="font-style:italic;"><a href="/wiki/Science_Daily" class="mw-redirect" title="Science Daily">Science Daily</a></span>, 16 gennaio 2014.</cite></span> </li> <li id="cite_note-4"><a href="#cite_ref-4"><b>^</b></a> <span class="reference-text"><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20130906193501/http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview&ARTICLEID_CHAR=3BC08F0C-2B35-221B-67A9F2AE04AFC79A"><span style="font-style:italic;">Ripples in a Galactic Pond</span></a>, in <span style="font-style:italic;">Scientific American</span>, ottobre 2005 <small>(archiviato dall'<abbr title="http://www.sciamdigital.com/index.cfm?fa=Products.ViewIssuePreview&ARTICLEID_CHAR=3BC08F0C-2B35-221B-67A9F2AE04AFC79A">url originale</abbr> il 6 settembre 2013)</small>.</cite></span> </li> <li id="cite_note-5"><a href="#cite_ref-5"><b>^</b></a> <span class="reference-text"><cite class="citation pubblicazione" style="font-style:normal"> R. A. Benjamin, E. Churchwell, B. L. Babler, R. Indebetouw, M. R. Meade, B. A. Whitney, C. Watson, M. G. Wolfire, M. J. Wolff, R. Ignace, T. M. Bania, S. Bracker, D. P. Clemens, L. Chomiuk, M. Cohen, J. M. Dickey, J. M. Jackson, H. A. Kobulnicky, E. P. Mercer, J. S. Mathis, S. R. Stolovy e B. 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Cortese, <a rel="nofollow" class="external text" href="https://oadoi.org/10.1111/j.1365-2966.2006.11369.x"><span style="font-style:italic;">The strong transformation of spiral galaxies infalling into massive clusters atz≈ 0.2</span></a>, in <span style="font-style:italic;">Monthly Notices of the Royal Astronomical Society</span>, vol. 376, n. 1, 2007, pp. 157–172, <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>:<a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/2007MNRAS.376..157C">2007MNRAS.376..157C</a>, <a href="/wiki/Digital_object_identifier" title="Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1111%2Fj.1365-2966.2006.11369.x">10.1111/j.1365-2966.2006.11369.x</a>, <a href="/wiki/ArXiv" title="ArXiv">arXiv</a>:<a rel="nofollow" class="external text" href="http://arxiv.org/abs/astro-ph/0703012">astro-ph/0703012</a>.</cite></span> </li> <li id="cite_note-Fumagalli2011-9"><a href="#cite_ref-Fumagalli2011_9-0"><b>^</b></a> <span class="reference-text"><cite class="citation pubblicazione" style="font-style:normal"> Mattia Fumagalli, G. 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Ogle, Lauranne Lanz e Cyril Nader, <a rel="nofollow" class="external text" href="https://iopscience.iop.org/article/10.3847/0004-637X/817/2/109"><span style="font-style:italic;">SUPERLUMINOUS SPIRAL GALAXIES</span></a>, in <span style="font-style:italic;">The Astrophysical Journal</span>, vol. 817, n. 2, 27 gennaio 2016, p. 109, <a href="/wiki/Digital_object_identifier" title="Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.3847%2F0004-637X%2F817%2F2%2F109">10.3847/0004-637X/817/2/109</a>. <small>URL consultato il 1º giugno 2020</small>.</cite></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Galassia_a_spirale&veaction=edit&section=4" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Galassia_a_spirale&action=edit&section=4" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Galassia_a_spirale_flocculenta" title="Galassia a spirale flocculenta">Galassia a spirale flocculenta</a></li> <li><a href="/wiki/Galassia_a_spirale_grand_design" title="Galassia a spirale grand design">Galassia a spirale grand design</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Galassia_a_spirale&veaction=edit&section=5" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Galassia_a_spirale&action=edit&section=5" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; color: black; font-weight: bold; margin: 0"><span>Altri progetti</span></p><ul title="Collegamenti verso gli altri progetti Wikimedia"> <li class="" title=""><span class="plainlinks" title="commons:Category:Spiral galaxies"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Spiral_galaxies?uselang=it">Wikimedia Commons</a></span></li></ul></div> <ul><li><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/?uselang=it" title="Collabora a Wikimedia Commons"><img alt="Collabora a Wikimedia Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png" decoding="async" width="18" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/27px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/36px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/?uselang=it">Wikimedia Commons</a></span> contiene immagini o altri file su <b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Spiral_galaxies?uselang=it">galassia spirale</a></span></b></li></ul> <div class="mw-heading mw-heading2"><h2 id="Collegamenti_esterni">Collegamenti esterni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Galassia_a_spirale&veaction=edit&section=6" title="Modifica la sezione Collegamenti esterni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Galassia_a_spirale&action=edit&section=6" title="Edit section's source code: Collegamenti esterni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20160304185015/http://archive.oapd.inaf.it/MOSTRA/NEW/A5002SPI.HTM">Le galassie spirali</a> INAF -Astronomical Observatory of Padova</li></ul> <p><a rel="nofollow" class="external text" href="https://web.archive.org/web/20060101031415/http://www.seds.org/messier/spir.html">Spiral Galaxies</a>, SEDS Messier pages </p> <style data-mw-deduplicate="TemplateStyles:r141815314">.mw-parser-output .navbox{border:1px solid #aaa;clear:both;margin:auto;padding:2px;width:100%}.mw-parser-output .navbox th{padding-left:1em;padding-right:1em;text-align:center}.mw-parser-output .navbox>tbody>tr:first-child>th{background:#ccf;font-size:90%;width:100%;color:var(--color-base,black)}.mw-parser-output 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.navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-os .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-os .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}</style><table class="navbox mw-collapsible autocollapse noprint metadata" id="navbox-Classificazione_galattica"><tbody><tr><th colspan="2"><div class="navbox_navbar"><div class="noprint plainlinks" style="background-color:transparent; padding:0; font-size:xx-small; color:var(--color-base, #000000); white-space:nowrap;"><a href="/wiki/Template:Classificazione_galattica" title="Template:Classificazione galattica"><span title="Vai alla pagina del template">V</span></a> · <a href="/w/index.php?title=Discussioni_template:Classificazione_galattica&action=edit&redlink=1" class="new" title="Discussioni template:Classificazione galattica (la pagina non esiste)"><span title="Discuti del template">D</span></a> · <a class="external text" href="https://it.wikipedia.org/w/index.php?title=Template:Classificazione_galattica&action=edit"><span title="Modifica il template. Usa l'anteprima prima di salvare">M</span></a></div></div><span class="navbox_title"><a href="/wiki/Sequenza_di_Hubble" title="Sequenza di Hubble">Classificazione galattica</a></span></th></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Galaxy_morphological_classification" class="mw-redirect" title="Galaxy morphological classification">Galaxy morphological classification</a></th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/Galaxy_morphological_classification" class="mw-redirect" title="Galaxy morphological classification">Galaxy morphological classification</a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Sequenza_di_Hubble" title="Sequenza di Hubble">Sequenza di Hubble</a></th><td colspan="1" class="navbox_list navbox_even"><a href="/wiki/Galassia_ellittica" title="Galassia ellittica">Ellittica</a><b> ·</b> <a href="/wiki/Galassia_lenticolare" title="Galassia lenticolare">Lenticolare</a><b> ·</b> <a href="/wiki/Spirale" title="Spirale">Spirale</a></td></tr><tr><th colspan="1" class="navbox_group"><a class="mw-selflink selflink">Galassia a spirale</a></th><td colspan="1" class="navbox_list navbox_odd"><a class="mw-selflink selflink">Spirale (S, Sa, Sb, Sc)</a><b> ·</b> <a href="/wiki/Galassia_a_spirale_intermedia" title="Galassia a spirale intermedia">Intermedia (SAB)</a><b> ·</b> <a href="/wiki/Galassia_a_spirale_barrata" title="Galassia a spirale barrata">Barrata (SB, SBa, SBb, SBc)</a><b> ·</b> <a href="/wiki/Galassia_a_spirale_magellanica" title="Galassia a spirale magellanica">Magellanica (Sm, SAm, SABm, SBm)</a><b> ·</b> <a href="/wiki/Galassia_a_spirale_grand_design" title="Galassia a spirale grand design">Grand Design</a><b> ·</b> <a href="/wiki/Galassia_a_spirale_superluminosa" title="Galassia a spirale superluminosa">Super Spirale</a><b> ·</b> <a href="/wiki/Galassia_a_spirale_flocculenta" title="Galassia a spirale flocculenta">Spirale Flocculenta</a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Galassia_nana" title="Galassia nana">Nane</a></th><td colspan="1" class="navbox_list navbox_even"><a href="/wiki/Galassia_nana_ellittica" title="Galassia nana ellittica">Ellittica (dE)</a><b> ·</b> <a href="/wiki/Galassia_nana_a_spirale" title="Galassia nana a spirale">Spirale (dS)</a><b> ·</b> <a href="/wiki/Galassia_nana_irregolare" title="Galassia nana irregolare">Irregolare (dI)</a><b> ·</b> <a href="/wiki/Galassia_nana_sferoidale" title="Galassia nana sferoidale">Sferoidale (dSph)</a><b> ·</b> <a href="/wiki/Galassia_nana_ultra-compatta" title="Galassia nana ultra-compatta">Ultra-compatta (UCD)</a><b> ·</b> <a href="/wiki/Galassia_nana_ultra-debole" title="Galassia nana ultra-debole">Ultra-debole (UFD)</a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Galassia_peculiare" title="Galassia peculiare">Peculiari (Pec)</a></th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/Galassia_ad_anello" title="Galassia ad anello">Ad anello</a><b> ·</b> <a href="/wiki/Galassia_ad_anello_polare" title="Galassia ad anello polare">Ad anello polare</a><b> ·</b> <a href="/wiki/Galassia_irregolare" title="Galassia irregolare">Irregolare (Irr)</a></td></tr><tr><th colspan="1" class="navbox_group"><a href="/wiki/Galassia_attiva" title="Galassia attiva">Attive (AGN)</a></th><td colspan="1" class="navbox_list navbox_even"><a href="/wiki/Radiogalassia" title="Radiogalassia">Radiogalassia</a><b> ·</b> <a href="/wiki/Radiogalassia_a_forma_di_X" title="Radiogalassia a forma di X">Radiogalassia a forma di X</a><b> ·</b> <a href="/wiki/Quasar" title="Quasar">Quasar</a><b> ·</b> <a href="/wiki/Blazar" title="Blazar">Blazar</a><b> ·</b> <a href="/wiki/Oggetto_BL_Lacertae" title="Oggetto BL Lacertae">BL Lacertae</a><b> ·</b> <a href="/wiki/Galassia_di_Seyfert" title="Galassia di Seyfert">Seyfert</a><b> ·</b> <a href="/wiki/Galassia_di_Markarian" title="Galassia di Markarian">Markarian</a><b> ·</b> <a href="/wiki/Regione_nucleare_a_linee_di_emissione_a_bassa_ionizzazione" title="Regione nucleare a linee di emissione a bassa ionizzazione">LINER</a><b> ·</b> <a href="/wiki/Getto_relativistico" title="Getto relativistico">Getto relativistico</a></td></tr><tr><th colspan="1" class="navbox_group">Galassie energetiche</th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/Galassia_luminosa_all%27infrarosso" title="Galassia luminosa all'infrarosso">LIRG</a><b> ·</b> <a href="/wiki/Galassia_starburst" title="Galassia starburst">Galassia starburst</a><b> ·</b> <a href="/wiki/Galassia_nana_compatta_blu" title="Galassia nana compatta blu">Galassia nana compatta blu</a><b> ·</b> <a href="/wiki/Pea_Galaxy" title="Pea Galaxy">Pea Galaxy</a></td></tr><tr><th colspan="1" class="navbox_group">A bassa attività</th><td colspan="1" class="navbox_list navbox_even"><a href="/wiki/Galassia_a_bassa_luminosit%C3%A0_superficiale" title="Galassia a bassa luminosità superficiale">Galassia 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luminosa">BCG</a><b> ·</b> <a href="/wiki/Gruppo_di_galassie#Gruppi_fossili" title="Gruppo di galassie">Galassia fossile</a><b> ·</b> <a href="/wiki/Galassie_interagenti" title="Galassie interagenti">Galassie interagenti</a><b> ·</b> <a href="/wiki/Galassia_satellite" title="Galassia satellite">Galassia satellite</a><b> ·</b> <a href="/wiki/Corrente_stellare" title="Corrente stellare">Corrente stellare</a><b> ·</b> <a href="/wiki/Superammasso_di_galassie" title="Superammasso di galassie">Superammasso di galassie</a><b> ·</b> <a href="/wiki/Filamento_(astronomia)" title="Filamento (astronomia)">Filamenti e muri</a><b> ·</b> <a href="/wiki/Vuoto_(astronomia)" title="Vuoto (astronomia)">Vuoti e supervuoti</a></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r140554510">.mw-parser-output .CdA{border:1px solid #aaa;width:100%;margin:auto;font-size:90%;padding:2px}.mw-parser-output .CdA th{background-color:#f2f2f2;font-weight:bold;width:20%}@media 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