{"id":9132,"date":"2018-04-19T07:28:35","date_gmt":"2018-04-19T07:28:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9132"},"modified":"2018-04-29T11:54:57","modified_gmt":"2018-04-29T11:54:57","slug":"jeune-lune-brillante-venus-17-avril","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/04\/19\/jeune-lune-brillante-venus-17-avril\/","title":{"rendered":"La jeune Lune et la brillante V\u00e9nus dans la soir\u00e9e du 17 avril"},"content":{"rendered":"

C’est le moment de d\u00e9couvrir la plan\u00e8te V\u00e9nus qui \u00e9tincelle au cr\u00e9puscule. Le 17 avril la jeune Lune \u00e9tait de retour \u00e0 proximit\u00e9.\u00a0<\/strong><\/p>\n

V\u00e9nus est pour quelques mois l’astre ponctuel le plus brillant dans le ciel du soir (sa magnitude<\/a> avoisine -4). Apr\u00e8s sa conjonction sup\u00e9rieure avec le Soleil<\/a> en janvier dernier, la seconde plan\u00e8te du Syst\u00e8me solaire est remont\u00e9e au-dessus de l’horizon OUEST et plane d\u00e9sormais loin des lueurs du couchant. Le 19 avril un jeune croissant de Lune accompagn\u00e9 d’une discr\u00e8te lumi\u00e8re cendr\u00e9e<\/a> se situait \u00e0 un peu plus de 5\u00b0 en dessous.<\/p>\n

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

V\u00e9nus est-elle vraiment fid\u00e8le \u00e0 l\u2019image que l\u2019on se fait de la d\u00e9esse de l\u2019amour, de la s\u00e9duction et de la beaut\u00e9\u00a0?<\/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\u2019un 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.<\/p>\n

<\/span>Cette temp\u00e9rature s\u2019explique par la pr\u00e9sence d\u2019une 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\u00a0t\u00e9lescopes<\/a>), un m\u00e9lange qui retient tr\u00e8s bien la chaleur solaire (V\u00e9nus \u00e9tant plus proche du\u00a0Soleil\u00a0<\/a>que ne l\u2019est la Terre).<\/p>\n

Pour contourner cette difficult\u00e9, la NASA, jamais \u00e0 court de bonnes id\u00e9es, a envisag\u00e9 d’envoyer des humains sur V\u00e9nus \u00e0 bord de\u00a0dirigeables\u00a0<\/a>; \u00e0 50 km d\u2019altitude, la pression atmosph\u00e9rique et le flux de radiations cosmiques seraient comparables \u00e0 ce qu\u2019on trouve sur Terre. Quant \u00e0 la temp\u00e9rature, elle ne serait plus \u00ab\u00a0que\u00a0\u00bb de 75\u00b0C\u2026<\/p>\n

En attendant il faudra se contenter encore quelques temps des images fournies par les sondes spatiales comme\u00a0Magellan\u00a0<\/a>ou\u00a0V\u00e9nus Express<\/a>. Elles ont r\u00e9v\u00e9l\u00e9 la pr\u00e9sence d\u2019un volcanisme actif assez r\u00e9cent (la lave devait couler sur V\u00e9nus il y a quelques centaines d\u2019ann\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\u2019une ann\u00e9e sur V\u00e9nus\u00a0!<\/p>\n","protected":false},"excerpt":{"rendered":"

C’est le moment de d\u00e9couvrir la plan\u00e8te V\u00e9nus qui \u00e9tincelle au cr\u00e9puscule. Le 17 avril la jeune Lune \u00e9tait de retour \u00e0 proximit\u00e9.\u00a0 V\u00e9nus est pour quelques mois l’astre ponctuel le plus brillant dans le ciel du soir (sa magnitude avoisine -4). Apr\u00e8s sa conjonction sup\u00e9rieure avec le Soleil en janvier dernier, la seconde plan\u00e8te … Continuer la lecture de La jeune Lune et la brillante V\u00e9nus dans la soir\u00e9e du 17 avril<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9133,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1154,88,159],"class_list":["post-9132","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-jeune-lune","tag-lumiere-cendree","tag-venus"],"yoast_head":"\nLa jeune Lune et la brillante V\u00e9nus dans la soir\u00e9e du 17 avril<\/title>\n<meta name=\"description\" content=\"C'est le moment de d\u00e9couvrir la plan\u00e8te V\u00e9nus qui \u00e9tincelle au cr\u00e9puscule. 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