{"id":1996,"date":"2015-03-29T06:46:58","date_gmt":"2015-03-29T06:46:58","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1996"},"modified":"2015-04-01T04:55:31","modified_gmt":"2015-04-01T04:55:31","slug":"venus-une-planete-bien-inhospitaliere","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/03\/29\/venus-une-planete-bien-inhospitaliere\/","title":{"rendered":"V\u00e9nus, une plan\u00e8te bien inhospitali\u00e8re"},"content":{"rendered":"

On a beaucoup parl\u00e9 de V\u00e9nus <\/a>ces derni\u00e8res semaines, apr\u00e8s ses rapprochements apparents avec les plan\u00e8tes Mercure <\/a>puis Mars<\/a>. Mais V\u00e9nus<\/a>, seconde plan\u00e8te du Syst\u00e8me solaire, est-elle vraiment fid\u00e8le \u00e0 l’image que l’on se fait de la d\u00e9esse de l’amour, de la s\u00e9duction et de la beaut\u00e9\u00a0?<\/p>\n

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

Pas vraiment, non\u00a0! Autrefois consid\u00e9r\u00e9e comme jumelle de la Terre en raison de sa taille identique, V\u00e9nus est victime d’un terrible effet de serre\u00a0: \u00e0 sa surface (o\u00f9 la pression est de 93 bars !)\u00a0le thermom\u00e8tre flirte all\u00e8grement avec les 470\u00b0 C. <\/span><\/p>\n

Cette temp\u00e9rature s’explique par la pr\u00e9sence d’une atmosph\u00e8re compos\u00e9e principalement de dioxyde de carbone et de nuages de soufre (qui emp\u00eachent de voir les reliefs v\u00e9nusiens dans nos t\u00e9lescopes<\/a>), un m\u00e9lange qui retient tr\u00e8s bien la chaleur solaire (V\u00e9nus \u00e9tant plus proche du Soleil <\/a>que ne l’est la Terre).<\/p>\n

Pour contourner cette difficult\u00e9, la NASA, jamais \u00e0 court de bonnes id\u00e9es, vient de sugg\u00e9rer qu’on pourrait envoyer des humains sur V\u00e9nus \u00e0 bord de dirigeables\u00a0<\/a>; \u00e0 50 km d’altitude, la pression atmosph\u00e9rique et le flux de radiations cosmiques seraient comparables \u00e0 ce qu’on trouve sur Terre. Quant \u00e0 la temp\u00e9rature, elle ne serait plus \u00ab\u00a0que\u00a0\u00bb de 75\u00b0C…<\/p>\n

En attendant il faudra se contenter encore quelques temps des images fournies par les sondes spatiales comme Magellan <\/a>ou V\u00e9nus Express<\/a>. Elles ont r\u00e9v\u00e9l\u00e9 la pr\u00e9sence d’un volcanisme actif assez r\u00e9cent (la lave devait couler sur V\u00e9nus il y a quelques centaines d’ann\u00e9es). Derni\u00e8re curiosit\u00e9\u00a0: une journ\u00e9e sur V\u00e9nus dure 243 de nos jours terrestres alors que la plan\u00e8te met 225 jours \u00e0 faire le tour du Soleil. Un jour est donc plus long qu’une ann\u00e9e sur V\u00e9nus\u00a0!<\/p>\n","protected":false},"excerpt":{"rendered":"

On a beaucoup parl\u00e9 de V\u00e9nus ces derni\u00e8res semaines, apr\u00e8s ses rapprochements apparents avec les plan\u00e8tes Mercure puis Mars. Mais V\u00e9nus, seconde plan\u00e8te du Syst\u00e8me solaire, est-elle vraiment fid\u00e8le \u00e0 l’image que l’on se fait de la d\u00e9esse de l’amour, de la s\u00e9duction et de la beaut\u00e9\u00a0? Pas vraiment, non\u00a0! Autrefois consid\u00e9r\u00e9e comme jumelle de … Continuer la lecture de V\u00e9nus, une plan\u00e8te bien inhospitali\u00e8re<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1997,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[860,862,859,389,116,140,486,114,97,861,160,159,3],"class_list":["post-1996","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-dioxyde-de-carbone","tag-dirigeable","tag-effet-de-serre","tag-lave","tag-mars","tag-mercure","tag-nasa","tag-planete","tag-soleil","tag-soufre","tag-systeme-solaire","tag-venus","tag-volcan"],"yoast_head":"\nV\u00e9nus, une plan\u00e8te bien inhospitali\u00e8re<\/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\/03\/29\/venus-une-planete-bien-inhospitaliere\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u00e9nus, une plan\u00e8te bien inhospitali\u00e8re\" \/>\n<meta property=\"og:description\" content=\"On a beaucoup parl\u00e9 de V\u00e9nus ces derni\u00e8res semaines, apr\u00e8s ses rapprochements apparents avec les plan\u00e8tes Mercure puis Mars. 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