{"id":1199,"date":"2014-11-20T08:30:43","date_gmt":"2014-11-20T08:30:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1199"},"modified":"2014-11-23T08:24:05","modified_gmt":"2014-11-23T08:24:05","slug":"tempetes-geantes-sur-uranus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/20\/tempetes-geantes-sur-uranus\/","title":{"rendered":"Temp\u00eates g\u00e9antes sur Uranus"},"content":{"rendered":"

Depuis sa d\u00e9couverte en 1781 par William Herschel<\/a>, Uranus fait peu parler d’elle. Il faut dire que la septi\u00e8me plan\u00e8te du Syst\u00e8me solaire est une g\u00e9ante glac\u00e9e (dont le diam\u00e8tre d\u00e9passe 50.000 kilom\u00e8tres) qui vogue \u00e0 pr\u00e8s de 3 milliards de kilom\u00e8tres de nous et pr\u00e9sente donc peu d’int\u00e9r\u00eat \u00e0 priori.<\/p>\n

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

D’ailleurs les seules images de la surface r\u00e9alis\u00e9es par une sonde (Voyager<\/em> en 1986) avaient convaincu les astronomes de classer Uranus\u00a0comme un astre sans caract\u00e9ristique particuli\u00e8re en lumi\u00e8re visible, o\u00f9 l’on ne trouvait aucune des perturbations atmosph\u00e9riques connues sur les autres plan\u00e8tes gazeuses (comme Jupiter <\/a>et Saturne<\/a>).<\/p>\n

Depuis 2007 et le passage d’Uranus \u00e0 l’\u00e9quinoxe <\/a>(l’ensoleillement \u00e9tant alors maximal \u00e0 l’\u00e9quateur de la plan\u00e8te), les choses ont bien chang\u00e9. Gr\u00e2ce au t\u00e9lescope <\/a>spatial Hubble et aux observateurs terrestres qui assurent une veille r\u00e9guli\u00e8re avec des instruments de plus en plus performants, on a commenc\u00e9 \u00e0 observer des modifications de la m\u00e9t\u00e9o sur Uranus.<\/p>\n

C’est ainsi que l’\u00e9t\u00e9 dernier les grands t\u00e9lescopes professionnels ont photographi\u00e9 d’\u00e9normes temp\u00eates (image ci-dessus) sous forme de nuages clairs dont la couleur pourrait s’expliquer par la remont\u00e9e de glace de m\u00e9thane. Ces temp\u00eates gigantesques (qui sont pouss\u00e9es par des vents pouvant atteindre 900 km\/h) sont devenues tellement imposantes qu’elles ont m\u00eame pu \u00eatre imag\u00e9es par des astronomes amateurs (image ci-dessous).<\/p>\n

\"uranus\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Depuis sa d\u00e9couverte en 1781 par William Herschel, Uranus fait peu parler d’elle. Il faut dire que la septi\u00e8me plan\u00e8te du Syst\u00e8me solaire est une g\u00e9ante glac\u00e9e (dont le diam\u00e8tre d\u00e9passe 50.000 kilom\u00e8tres) qui vogue \u00e0 pr\u00e8s de 3 milliards de kilom\u00e8tres de nous et pr\u00e9sente donc peu d’int\u00e9r\u00eat \u00e0 priori. D’ailleurs les seules images … Continuer la lecture de Temp\u00eates g\u00e9antes sur Uranus<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1200,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[94,218,378,546,90,275,155,114,136,543,160,544,545,128,547,129],"class_list":["post-1199","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-astronome","tag-equateur","tag-equinoxe","tag-glace-de-methane","tag-jupiter","tag-meteo","tag-nuage","tag-planete","tag-saturne","tag-sonde-voyager","tag-systeme-solaire","tag-telescope-spatial-hubble","tag-tempete","tag-uranus","tag-vent","tag-william-herschel"],"yoast_head":"\nuranus<\/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\/2014\/11\/20\/tempetes-geantes-sur-uranus\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"uranus\" \/>\n<meta property=\"og:description\" content=\"Depuis sa d\u00e9couverte en 1781 par William Herschel, Uranus fait peu parler d’elle. Il faut dire que la septi\u00e8me plan\u00e8te du Syst\u00e8me solaire est une g\u00e9ante glac\u00e9e (dont le diam\u00e8tre d\u00e9passe 50.000 kilom\u00e8tres) qui vogue \u00e0 pr\u00e8s de 3 milliards de kilom\u00e8tres de nous et pr\u00e9sente donc peu d’int\u00e9r\u00eat \u00e0 priori. 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