{"id":1033,"date":"2005-08-08T15:37:00","date_gmt":"2005-08-08T13:37:00","guid":{"rendered":"https:\/\/kids.esa.int\/venus_express_to_unveil_earth_s_twin\/"},"modified":"2026-10-08T00:35:07","modified_gmt":"2026-10-07T22:35:07","slug":"venus_express_to_unveil_earth_s_twin","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/venus_express_to_unveil_earth_s_twin\/","title":{"rendered":"Venus Express en route vers la soeur jumelle de la Terre"},"content":{"rendered":"
\n

Au cours des prochains mois, apr\u00e8s un coucher de soleil sans nuages, si vous regardez vers l\u2019ouest, vous ne manquerez pas d\u2019apercevoir une \u201c \u00e9toile du soir \u00bb \u00e9clatante. Mais ce spectacle \u00e9blouissant n\u2019est pas une \u00e9toile. Il s\u2019agit de la plan\u00e8te V\u00e9nus, la destination de la derni\u00e8re mission europ\u00e9enne vers l\u2019espace lointain.<\/p>\n<\/div>\n

Volant \u00e0 une distance comprise entre 250 et 66 000 km au-dessus de ses p\u00f4les, la sonde passera deux ann\u00e9es v\u00e9nusiennes (500 jours terrestres) \u00e0 \u00e9tudier l'\u00e9paisse couche nuageuse et l'atmosph\u00e8re de la plus proche voisine de la Terre.<\/p>\n

Orbitant entre 250 et 66 000 km au-dessus de ses p\u00f4les, la sonde passera deux ann\u00e9es v\u00e9nusiennes (500 jours terrestres) \u00e0 \u00e9tudier l'\u00e9paisse couche nuageuse et l'atmosph\u00e8re de la plan\u00e8te la plus proche de la Terre.<\/p>\n

\"Mariner
Quelle est la temp\u00e9rature de l'atmosph\u00e8re et de quoi est-elle compos\u00e9e ?<\/figcaption><\/figure>\n

Plus de 20 sondes spatiales russes et am\u00e9ricaines ont \u00e9t\u00e9 envoy\u00e9es pour explorer la deuxi\u00e8me plan\u00e8te \u00e0 partir du Soleil, mais de nombreux myst\u00e8res subsistent :<\/p>\n

    \n
  • \n

    Quelles sont la temp\u00e9rature et la composition de l'atmosph\u00e8re ?<\/p>\n<\/li>\n

  • \n

    Comment l'atmosph\u00e8re circule-t-elle ?<\/p>\n<\/li>\n

  • \n

    Comment sa composition change-t-elle du haut vers le bas ?<\/p>\n<\/li>\n

  • \n

    Comment l'atmosph\u00e8re interagit-elle avec la surface de la plan\u00e8te ?<\/p>\n<\/li>\n

  • \n

    Comment la haute atmosph\u00e8re interagit-elle avec le vent solaire ?<\/p>\n<\/li>\n<\/ul>\n

    Les sept instruments scientifiques embarqu\u00e9s \u00e0 bord de Venus Express tenteront de percer ces myst\u00e8res.<\/p>\n

    Comme le sugg\u00e8re son nom, Venus Express a \u00e9t\u00e9 con\u00e7ue et construite en trois ans seulement \u2013 un temps record pour un projet de cette ampleur. Similaire \u00e0 l'orbiteur Mars Express de l'ESA, qui est un grand succ\u00e8s, cette sonde a \u00e9t\u00e9 adapt\u00e9e pour supporter des temp\u00e9ratures et un rayonnement plus \u00e9lev\u00e9s autour de V\u00e9nus. La plupart des instruments reprenent ceux qui avaient \u00e9t\u00e9 d\u00e9velopp\u00e9s pour les missions Mars Express et Rosetta.<\/p>","protected":false},"excerpt":{"rendered":"

    Look towards the west after a cloudless sunset during the coming months and you cannot fail to see a brilliant “evening star. But this dazzling sight is no star. It […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2004\/04\/artist_s_impression_of_venus_express2\/17881955-2-eng-GB\/Artist_s_impression_of_Venus_Express.jpg","esa_banner_description":"Artist's impression of Venus Express","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/04\/Artist_s_impression_of_Venus_Express2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1033","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=1033"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1033\/revisions"}],"predecessor-version":[{"id":4808,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1033\/revisions\/4808"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1033"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1033"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1033"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1033"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1033"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1033"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1033"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}