{"id":5926,"date":"2016-06-16T15:45:12","date_gmt":"2016-06-16T15:45:12","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5926"},"modified":"2016-06-23T15:24:06","modified_gmt":"2016-06-23T15:24:06","slug":"voyager-2-immortalisait-neptune-triton","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/16\/voyager-2-immortalisait-neptune-triton\/","title":{"rendered":"Quand Voyager 2 immortalisait Neptune et Triton"},"content":{"rendered":"<p><strong>Les images acquises par les sondes<em> Voyager<\/em> il y a plus de 25 ans font toujours r\u00eaver, comme ce portrait des croissants de Neptune et Triton.\u00a0<\/strong><\/p>\n<p>Neptune a \u00e9t\u00e9 d\u00e9couverte le 23 septembre 1846 par l&#8217;astronome allemand\u00a0Johann Gottfried Galle qui se basa sur les calculs que lui avait transmis l&#8217;astronome et math\u00e9maticien fran\u00e7ais\u00a0Urbain Le Verrier. La sonde am\u00e9ricaine <a href=\"http:\/\/voyager.jpl.nasa.gov\/\" target=\"_blank\"><em>Voyager 2<\/em><\/a>, qui avait quitt\u00e9 la Terre le 20 ao\u00fbt 1977, survola Neptune en ao\u00fbt 1989, trois ans apr\u00e8s son passage \u00e0 proximit\u00e9 d&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/20\/tempetes-geantes-sur-uranus\/\" target=\"_blank\">Uranus<\/a>.<\/p>\n<p>Dix-sept fois plus massive que la Terre, la huiti\u00e8me plan\u00e8te du Syst\u00e8me solaire met plus de 160 ans \u00e0 parcourir son orbite autour du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/14\/15-images-pour-detailler-un-lever-de-soleil\/\" target=\"_blank\">Soleil<\/a>. Comme Uranus, Neptune est une g\u00e9ante de glace dont l&#8217;atmosph\u00e8re se compose principalement d&#8217;hydrog\u00e8ne, d&#8217;h\u00e9lium et de m\u00e9thane qui lui donne son \u00e9tonnante couleur bleue.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/neptune_triton.jpg\" rel=\"lightbox[5926]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5927\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/neptune_triton-450x338.jpg\" alt=\"neptune_triton\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/neptune_triton-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/neptune_triton-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/neptune_triton-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/06\/neptune_triton.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Quant \u00e0 Triton, le plus gros des 14 satellites de Neptune avec un diam\u00e8tre d&#8217;environ 2.760 kilom\u00e8tres,il a \u00e9t\u00e9 d\u00e9couvert \u00a0le 10 octobre 1846 par l&#8217;astronome britannique William Lassell. Triton a sans doute \u00e9t\u00e9 captur\u00e9 par Neptune comme semble l&#8217;indiquer son orbite r\u00e9trograde (le satellite tourne dans le sens inverse de la rotation de la plan\u00e8te).\u00a0<!--more--><\/p>\n<p>Les images de la sonde<em> Voyager 2<\/em> ont r\u00e9v\u00e9l\u00e9 la pr\u00e9sence sur Triton d\u2019un volcanisme actif (pr\u00e9sence de panaches atmosph\u00e9riques) comparable \u00e0 celui qu&#8217;on rencontre sur d&#8217;autres lunes du Syst\u00e8me solaire comme Io (satellite de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/07\/8-mars-la-planete-jupiter-est-au-plus-pres-de-la-terre\/\" target=\"_blank\">Jupiter<\/a>) ou encore <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/18\/gros-plan-sur-la-banquise-dencelade-satellite-de-saturne\/\" target=\"_blank\">Encelade<\/a> (qui gravite autour de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/01\/admirez-planete-saturne-plus-pres-de-terre\/\" target=\"_blank\">Saturne<\/a>).<\/p>\n<p>R\u00e9alis\u00e9e le 31 ao\u00fbt 1989, cette image a sans doute fait r\u00eaver \u00e0 l&#8217;\u00e9poque le regrett\u00e9 <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/05\/16\/video-andre-brahic-defendait-lhomo-rigolus\/\" target=\"_blank\">Andr\u00e9 Brahic<\/a>, l&#8217;astrophysicien fran\u00e7ais d\u00e9c\u00e9d\u00e9 le 15 mai 2016 et qui avait particip\u00e9 dans les ann\u00e9es 1980 aux missions <em>Voyager<\/em> aux c\u00f4t\u00e9s de l&#8217;exobiologiste <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/astronomie-anniversaire-carl-sagan-pionnier-exobiologie-25980\/\" target=\"_blank\">Carl Sagan<\/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>Les images acquises par les sondes Voyager il y a plus de 25 ans font toujours r\u00eaver, comme ce portrait des croissants de Neptune et Triton.\u00a0 Neptune a \u00e9t\u00e9 d\u00e9couverte le 23 septembre 1846 par l&#8217;astronome allemand\u00a0Johann Gottfried Galle qui se basa sur les calculs que lui avait transmis l&#8217;astronome et math\u00e9maticien fran\u00e7ais\u00a0Urbain Le Verrier. &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/16\/voyager-2-immortalisait-neptune-triton\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Quand Voyager 2 immortalisait Neptune et Triton<\/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":5927,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[639,654,1702,642,543,647,1703,1701],"class_list":["post-5926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-andre-brahic","tag-carl-sagan","tag-johann-gottfried-galle","tag-neptune","tag-sonde-voyager","tag-triton","tag-urbain-le-verrier","tag-voyager-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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