{"id":3039,"date":"2015-07-07T04:51:54","date_gmt":"2015-07-07T04:51:54","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3039"},"modified":"2018-09-29T06:43:07","modified_gmt":"2018-09-29T06:43:07","slug":"sharpless-308-une-bulle-cosmique-geante","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/","title":{"rendered":"Sharpless 308, une bulle cosmique g\u00e9ante"},"content":{"rendered":"

La constellation du Grand Chien cache une \u00e9tonnante n\u00e9buleuse,\u00a0Sharpless 308, qui ressemble \u00e0 une \u00e9norme bulle de savon.<\/strong><\/p>\n

En 1867 les astronomes fran\u00e7ais\u00a0Charles Wolf et Georges Rayet, qui travaillaient \u00e0 l’Observatoire de Paris, d\u00e9couvrirent une nouvelle cat\u00e9gorie d’\u00e9toiles, des astres chauds et massifs qui \u00e9jectent beaucoup de mati\u00e8re emport\u00e9e par un puissant vent stellaire.<\/p>\n

\"Sharpless_308\"<\/a><\/p>\n

Chez certaines \u00e9toiles de Wolf-Rayet le\u00a0vent stellaire est un milliard de fois plus \u00e9nerg\u00e9tique que le vent solaire \u00e0 l’origine de nos aurores bor\u00e9ales<\/a>.<\/p>\n

Les importantes quantit\u00e9s de gaz souffl\u00e9es dans l’espace donnent naissance \u00e0 une bulle. Cette enveloppe gazeuse est ionis\u00e9e par le rayonnement ultraviolet \u00e9mis par l’\u00e9toile.<\/p>\n

Un tr\u00e8s bel exemple de bulle de Wolf-Rayet nous est donn\u00e9 par la n\u00e9buleuse Sharpless 308, en expansion depuis 70000 ans. Cette bulle, situ\u00e9e \u00e0 5200 ann\u00e9es-lumi\u00e8re de nous, a une taille apparente l\u00e9g\u00e8rement sup\u00e9rieure \u00e0 celle de la Pleine Lune<\/a>.<\/p>\n

L’image ci-dessus a \u00e9t\u00e9 r\u00e9alis\u00e9e en mai 2015 par Kfir Simon<\/a> avec un t\u00e9lescope <\/a>de 40 cm de diam\u00e8tre install\u00e9 en Namibie.<\/p>\n","protected":false},"excerpt":{"rendered":"

La constellation du Grand Chien cache une \u00e9tonnante n\u00e9buleuse,\u00a0Sharpless 308, qui ressemble \u00e0 une \u00e9norme bulle de savon. En 1867 les astronomes fran\u00e7ais\u00a0Charles Wolf et Georges Rayet, qui travaillaient \u00e0 l’Observatoire de Paris, d\u00e9couvrirent une nouvelle cat\u00e9gorie d’\u00e9toiles, des astres chauds et massifs qui \u00e9jectent beaucoup de mati\u00e8re emport\u00e9e par un puissant vent stellaire. Chez … Continuer la lecture de Sharpless 308, une bulle cosmique g\u00e9ante<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3041,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[411,1115,1112,618,1114,1113],"class_list":["post-3039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-grand-chien","tag-kfir-simon","tag-sharpless-308","tag-vent-solaire","tag-vent-stellaire","tag-wolf-rayet"],"yoast_head":"\nSharpless 308, une bulle cosmique g\u00e9ante<\/title>\n<meta name=\"description\" content=\"La constellation du Grand Chien cache une \u00e9tonnante n\u00e9buleuse, Sharpless 308, qui ressemble \u00e0 une \u00e9norme bulle de savon.\" \/>\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\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sharpless 308, une bulle cosmique g\u00e9ante\" \/>\n<meta property=\"og:description\" content=\"La constellation du Grand Chien cache une \u00e9tonnante n\u00e9buleuse, Sharpless 308, qui ressemble \u00e0 une \u00e9norme bulle de savon.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2015-07-07T04:51:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-09-29T06:43:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/Sharpless_308.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1213\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jean-Baptiste FELDMANN\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Baptiste FELDMANN\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/\",\"name\":\"Sharpless 308, une bulle cosmique g\u00e9ante\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/Sharpless_308.jpg\",\"datePublished\":\"2015-07-07T04:51:54+00:00\",\"dateModified\":\"2018-09-29T06:43:07+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"description\":\"La constellation du Grand Chien cache une \u00e9tonnante n\u00e9buleuse, Sharpless 308, qui ressemble \u00e0 une \u00e9norme bulle de savon.\",\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/07\/sharpless-308-une-bulle-cosmique-geante\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/Sharpless_308.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/Sharpless_308.jpg\",\"width\":1213,\"height\":900},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/\",\"name\":\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\",\"description\":\""J'ai en moi un besoin terrible. 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