{"id":1390,"date":"2014-12-16T14:48:30","date_gmt":"2014-12-16T14:48:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1390"},"modified":"2015-12-18T20:55:22","modified_gmt":"2015-12-18T20:55:22","slug":"barnard-68-la-botte-du-pere-noel","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/16\/barnard-68-la-botte-du-pere-noel\/","title":{"rendered":"Barnard 68, la botte du P\u00e8re No\u00ebl"},"content":{"rendered":"<p><strong>Barnard 68 est un nuage de gaz tr\u00e8s froid appel\u00e9 globule de Bok. Il ressemble \u00e0 une tache d&#8217;encre au milieu des \u00e9toiles dans la constellation d&#8217;Ophiuchus.<\/strong><\/p>\n<p>Le P\u00e8re No\u00ebl aurait-il perdu une de ses bottes dans le ciel avant sa traditionnelle tourn\u00e9e ?\u00a0C&#8217;est ce que pourrait laisser penser cette tr\u00e8s belle image r\u00e9alis\u00e9e par le <a title=\"VLT\" href=\"http:\/\/www.eso.org\/public\/france\/teles-instr\/vlt\/\" target=\"_blank\"><em>Very Large Telescope<\/em><\/a> europ\u00e9en install\u00e9 au Chili, non loin du futur <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\/2014\/12\/eso.jpg\" rel=\"lightbox[1390]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1391\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/eso-450x450.jpg\" alt=\"eso\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/eso-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/eso-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/eso-1024x1024.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/12\/eso.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette masse sombre devant les <a title=\"Les demoiselles coiff\u00e9es sous les \u00e9toiles\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/10\/30\/les-demoiselles-coiffees-les-etoiles\/\" target=\"_blank\">\u00e9toiles <\/a>est Barnard 68, un nuage mol\u00e9culaire situ\u00e9 \u00e0 environ 450 ann\u00e9es-lumi\u00e8re. C&#8217;est \u00e0 la fin du XIX\u00e8me si\u00e8cle que l&#8217;astronome am\u00e9ricain E. E. Barnard le d\u00e9couvrit, alors qu&#8217;il photographiait la <a title=\"La Voie lact\u00e9e et le ch\u00e2teau\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/05\/voie-lactee-chateau\/\" target=\"_blank\">Voie lact\u00e9e<\/a>.<\/p>\n<p><!--more-->E. E. Barnard remarqua sur ses images d&#8217;autres &#8220;taches noires&#8221;, comme des gouttes d&#8217;encre pos\u00e9es sur un fond de millions de soleils. Barnard pensa longtemps qu&#8217;il s&#8217;agissait d&#8217;espaces vides d&#8217;\u00e9toiles (en 1927 il parlait encore de &#8220;trous sombres&#8221; dans son <a title=\"Atlas of the Milky Way \" href=\"http:\/\/www.library.gatech.edu\/barnard\/\" target=\"_blank\"><em>Atlas of the Milky Way<\/em><\/a>, atlas dans lequel ces trous portent son nom suivi d&#8217;un num\u00e9ro) avant de r\u00e9aliser qu&#8217;il s&#8217;agit de nuages opaques de gaz et de poussi\u00e8re.<\/p>\n<p>Ces nuages sont \u00e9galement appel\u00e9s globules de Bok, en hommage \u00e0 l&#8217;astronome B. Bok qui les \u00e9tudia dans les ann\u00e9es 1940. Le globule Barnard 68 mesure environ 12.500 unit\u00e9s a<span style=\"line-height: 1.5\">stronomiques et sa temp\u00e9rature avoisine les -260\u00b0 C. Les <a title=\"Lumi\u00e8re rouge pour les astronomes\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">astronomes <\/a>ne s&#8217;expliquent pas encore vraiment comment se forment de tels nuages mol\u00e9culaires tr\u00e8s froids, mais ils savent qu&#8217;ils sont susceptibles de s&#8217;effondrer sur eux-m\u00eame pour donner naissance \u00e0 de nouvelles <a title=\"Le ch\u00e2teau sous les \u00e9toiles\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/18\/chateau-les-etoiles\/\" target=\"_blank\">\u00e9toiles<\/a>. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span><\/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>Barnard 68 est un nuage de gaz tr\u00e8s froid appel\u00e9 globule de Bok. Il ressemble \u00e0 une tache d&#8217;encre au milieu des \u00e9toiles dans la constellation d&#8217;Ophiuchus. Le P\u00e8re No\u00ebl aurait-il perdu une de ses bottes dans le ciel avant sa traditionnelle tourn\u00e9e ?\u00a0C&#8217;est ce que pourrait laisser penser cette tr\u00e8s belle image r\u00e9alis\u00e9e par &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/16\/barnard-68-la-botte-du-pere-noel\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Barnard 68, la botte du P\u00e8re No\u00ebl<\/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":1391,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[279,94,670,667,635,666,632,669,89,527,671,668,665,515,672,637,166],"class_list":["post-1390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-annee-lumiere","tag-astronome","tag-atlas","tag-barnard-68","tag-chili","tag-constellation-dophiuchus","tag-e-elt","tag-e-e-barnard","tag-etoile","tag-gaz","tag-globule-de-bok","tag-nuage-moleculaire","tag-pere-noel","tag-poussiere","tag-unite-astronomique","tag-vlt","tag-voie-lactee"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Barnard 68, la botte du P\u00e8re No\u00ebl<\/title>\n<meta name=\"description\" content=\"Barnard 68 est un nuage de gaz tr\u00e8s froid appel\u00e9 globule de Bok. 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