{"id":1606,"date":"2015-01-19T06:22:58","date_gmt":"2015-01-19T06:22:58","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1606"},"modified":"2015-01-24T10:15:44","modified_gmt":"2015-01-24T10:15:44","slug":"ldn-483-une-nebuleuse-sombre-dans-le-serpent","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/19\/ldn-483-une-nebuleuse-sombre-dans-le-serpent\/","title":{"rendered":"LDN 483, une n\u00e9buleuse sombre dans le Serpent"},"content":{"rendered":"<p>Situ\u00e9 \u00e0 700 ann\u00e9es-lumi\u00e8re de la Terre dans la constellation du Serpent, <a title=\"O\u00f9 sont pass\u00e9es toutes les \u00e9toiles ?\" href=\"http:\/\/www.eso.org\/public\/france\/news\/eso1501\/#2\" target=\"_blank\">LDN 483<\/a> ( <em>Lynds Dark Nebula<\/em> 483) est la derni\u00e8re cible du <a title=\"En images : les t\u00e9lescopes des amateurs\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/14\/en-images-les-telescopes-amateurs\/\" target=\"_blank\">t\u00e9lescope <\/a>MPG\/ESO de 2,2 m\u00e8tres de diam\u00e8tre install\u00e9 \u00e0 l\u2019Observatoire de La Silla au Chili (\u00e0 une vingtaine de kilom\u00e8tres du futur t\u00e9lescope g\u00e9ant <a title=\"Feu vert pour le t\u00e9lescope g\u00e9ant E-ELT\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/13\/feu-vert-pour-le-telescope-geant-e-elt\/\" target=\"_blank\">E-ELT<\/a>).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/ldn.jpg\" rel=\"lightbox[1606]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1607\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/ldn-450x337.jpg\" alt=\"ldn\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/ldn-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/ldn-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/ldn.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>R\u00e9alis\u00e9 et publi\u00e9 en 1962 par <a title=\"Lumi\u00e8re rouge pour les astronomes\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">l\u2019astronome <\/a>am\u00e9ricain Beverly Turner Lynds, le catalogue <em>Lynds Dark Nebula<\/em> rassemble les n\u00e9buleuses sombres qui ont \u00e9t\u00e9 d\u00e9couvertes sur les plaques photographiques du <em>Palomar Sky Survey<\/em>, un important relev\u00e9 photographique du ciel nocturne r\u00e9alis\u00e9 \u00e0 l&#8217;observatoire du <a title=\"Palomar Observatory\" href=\"http:\/\/www.astro.caltech.edu\/palomar\/homepage.html\" target=\"_blank\">Mont Palomar<\/a> jusqu&#8217;en 1958.<\/p>\n<p><!--more-->Tout comme <a title=\"Barnard 68, la botte du P\u00e8re No\u00ebl\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/16\/barnard-68-la-botte-du-pere-noel\/\" target=\"_blank\">Barnard 68<\/a>, LDN 483 est un nuage de gaz et de poussi\u00e8re qui masque les <a title=\"Une coupole sous les \u00e9toiles\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/08\/392\/\" target=\"_blank\">\u00e9toiles <\/a>en arri\u00e8re-plan, donnant l&#8217;impression d&#8217;un trou g\u00e9ant et sombre.<\/p>\n<p>On pourrait penser \u00e0 premi\u00e8re vue que ce genre de nuage n&#8217;est pas favorable au d\u00e9veloppement des \u00e9toiles, mais c&#8217;est exactement le contraire\u00a0: il s&#8217;agit de v\u00e9ritables pouponni\u00e8res stellaires o\u00f9 de tr\u00e8s jeunes astres (des proto\u00e9toiles) sont encore trop froids (-250\u00b0C) pour \u00eatre d\u00e9celables aux longueurs d&#8217;onde du rayonnement visible.<\/p>\n<p>Lorsque les proto\u00e9toiles auront atteint une densit\u00e9 et une temp\u00e9rature suffisantes (dans plusieurs millions d&#8217;ann\u00e9es), elles se mettront \u00e0 briller comme notre <a title=\"Le Soleil dans la mer\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/07\/soleil-mer\/\" target=\"_blank\">Soleil<\/a>.<\/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>Situ\u00e9 \u00e0 700 ann\u00e9es-lumi\u00e8re de la Terre dans la constellation du Serpent, LDN 483 ( Lynds Dark Nebula 483) est la derni\u00e8re cible du t\u00e9lescope MPG\/ESO de 2,2 m\u00e8tres de diam\u00e8tre install\u00e9 \u00e0 l\u2019Observatoire de La Silla au Chili (\u00e0 une vingtaine de kilom\u00e8tres du futur t\u00e9lescope g\u00e9ant E-ELT). R\u00e9alis\u00e9 et publi\u00e9 en 1962 par &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/19\/ldn-483-une-nebuleuse-sombre-dans-le-serpent\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">LDN 483, une n\u00e9buleuse sombre dans le Serpent<\/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":1607,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[279,94,667,635,765,633,89,743,742,744,111,104,745,97,96],"class_list":["post-1606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-annee-lumiere","tag-astronome","tag-barnard-68","tag-chili","tag-constellation-du-serpent","tag-eso","tag-etoile","tag-la-silla","tag-ldn-483","tag-mont-palomar","tag-nebuleuse","tag-observatoire","tag-protoetoile","tag-soleil","tag-telescope"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LDN 483, une n\u00e9buleuse sombre dans le Serpent<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/19\/ldn-483-une-nebuleuse-sombre-dans-le-serpent\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LDN 483, une n\u00e9buleuse sombre dans le Serpent\" \/>\n<meta property=\"og:description\" content=\"Situ\u00e9 \u00e0 700 ann\u00e9es-lumi\u00e8re de la Terre dans la constellation du Serpent, LDN 483 ( Lynds Dark Nebula 483) est la derni\u00e8re cible du t\u00e9lescope MPG\/ESO de 2,2 m\u00e8tres de diam\u00e8tre install\u00e9 \u00e0 l\u2019Observatoire de La Silla au Chili (\u00e0 une vingtaine de kilom\u00e8tres du futur t\u00e9lescope g\u00e9ant E-ELT). 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