{"id":4550,"date":"2016-01-13T06:01:01","date_gmt":"2016-01-13T06:01:01","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4550"},"modified":"2016-01-21T05:25:46","modified_gmt":"2016-01-21T05:25:46","slug":"nebuleuse-de-lagune-pouponniere-detoiles","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/13\/nebuleuse-de-lagune-pouponniere-detoiles\/","title":{"rendered":"La n\u00e9buleuse de la Lagune, une pouponni\u00e8re d&#8217;\u00e9toiles"},"content":{"rendered":"<p><strong>C&#8217;est en pleine Voie lact\u00e9e, dans la constellation du Sagittaire, que niche la n\u00e9buleuse de la Lagune, un immense nuage d&#8217;hydrog\u00e8ne o\u00f9 naissent des \u00e9toiles.<\/strong><\/p>\n<p>On la surnomme\u00a0Messier 8, NGC 6523 ou encore la n\u00e9buleuse de la Lagune. Elle fut d\u00e9couverte en 1747\u00a0par Le Gentil, un astronome fran\u00e7ais rest\u00e9 c\u00e9l\u00e8bre pour sa malchance (il rata deux transits de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/12\/venus-mars-et-jupiter-setirent-le-long-de-lecliptique\/\" target=\"_blank\">V\u00e9nus <\/a>devant le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/11\/un-avion-de-ligne-passe-devant-le-soleil-tache\/\" target=\"_blank\">Soleil <\/a>en Inde en 1761 et en 1769). La n\u00e9buleuse entra quelques ann\u00e9es plus tard en huiti\u00e8me position dans le catalogue de Charles Messier mais c&#8217;est \u00e0 l&#8217;astronome anglaise Agn\u00e8s Clerke que revient l&#8217;honneur de l&#8217;avoir baptis\u00e9e n\u00e9buleuse de la Lagune en 1890.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/messier8.jpg\" rel=\"lightbox[4550]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4551\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/messier8-450x342.jpg\" alt=\"messier8\" width=\"450\" height=\"342\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/messier8-450x342.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/messier8-1024x778.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/12\/messier8.jpg 1395w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Situ\u00e9e \u00e0 un peu moins de 5000 ann\u00e9es-lumi\u00e8re de nous dans la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/23\/explosion-dune-etoile-dans-la-constellation-du-sagittaire\/\" target=\"_blank\">constellation du Sagittaire<\/a>, la n\u00e9buleuse de la Lagune mesure environ 110 ann\u00e9es-lumi\u00e8re, ce qui repr\u00e9sente \u00e0 cette distance un diam\u00e8tre apparent trois fois plus grand que la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/02\/en-video-la-pleine-lune-se-leve-en-australie\/\" target=\"_blank\">Pleine Lune<\/a>. Avec une magnitude de 5 elle devient visible \u00e0 l&#8217;\u0153il nu \u00e0 condition de s&#8217;\u00e9loigner de toute <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/28\/pollution-lumineuse\/\" target=\"_blank\">pollution lumineuse<\/a>.<\/p>\n<p><!--more-->Si Messier 8 pr\u00e9sente une belle couleur rose sur l&#8217;image ci-dessus (r\u00e9alis\u00e9e \u00e0 l&#8217;<a href=\"http:\/\/skycenter.arizona.edu\/gallery\/Nebulae\/M8_32in\" target=\"_blank\">Observatoire du mont Lemmon<\/a> en Arizona), c&#8217;est tout simplement parce que cet immense nuage d&#8217;hydrog\u00e8ne est ionis\u00e9 par le rayonnement ultraviolet de nombreuses jeunes \u00e9toiles tr\u00e8s chaudes de type O et B qui ont commenc\u00e9 \u00e0 briller il y a moins de 2 millions d&#8217;ann\u00e9es. Ces \u00e9toiles font partie de l&#8217;amas ouvert NGC 6530 (on en devine une partie sur la gauche de l&#8217;image).<\/p>\n<p>Les astronomes ont aussi d\u00e9couvert que la n\u00e9buleuse de la Lagune h\u00e9bergeait des \u00e9toiles tr\u00e8s instables appel\u00e9es <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/09\/deux-jets-de-gaz-symetriques-pour-herbig-haro-212\/\" target=\"_blank\">objets Herbig-Haro<\/a> ainsi que des r\u00e9gions tr\u00e8s sombres connues sous le nom de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/16\/barnard-68-la-botte-du-pere-noel\/\" target=\"_blank\">globules de Bok<\/a> dans lesquelles na\u00eetront un jour de nouvelles \u00e9toiles.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>C&#8217;est en pleine Voie lact\u00e9e, dans la constellation du Sagittaire, que niche la n\u00e9buleuse de la Lagune, un immense nuage d&#8217;hydrog\u00e8ne o\u00f9 naissent des \u00e9toiles. On la surnomme\u00a0Messier 8, NGC 6523 ou encore la n\u00e9buleuse de la Lagune. Elle fut d\u00e9couverte en 1747\u00a0par Le Gentil, un astronome fran\u00e7ais rest\u00e9 c\u00e9l\u00e8bre pour sa malchance (il rata &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/13\/nebuleuse-de-lagune-pouponniere-detoiles\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La n\u00e9buleuse de la Lagune, une pouponni\u00e8re d&#8217;\u00e9toiles<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":4551,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1419,133,496,671,1149,1418,1417,1416,1355,166],"class_list":["post-4550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-agnes-clerke","tag-charles-messier","tag-constellation-du-sagittaire","tag-globule-de-bok","tag-herbig-haro","tag-le-gentil","tag-messier-8","tag-nebuleuse-de-la-lagune","tag-observatoire-du-mont-lemmon","tag-voie-lactee"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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