{"id":1106,"date":"2006-01-20T13:10:00","date_gmt":"2006-01-20T12:10:00","guid":{"rendered":"https:\/\/kids.esa.int\/neptune\/"},"modified":"2026-10-08T00:36:04","modified_gmt":"2026-10-07T22:36:04","slug":"neptune","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/neptune\/","title":{"rendered":"Neptune"},"content":{"rendered":"
\n

Neptune a \u00e9t\u00e9 d\u00e9couverte en 1846 par Johann Galle, un astronome de l'Observatoire de Berlin. Pour son observation, Galle s'est bas\u00e9 sur les calculs du math\u00e9maticien fran\u00e7ais, Urbain Le Verrier. Le Verrier et John Adams en Angleterre avaient compris qu'une plan\u00e8te inconnue tirait Uranus, en causant son ralentissement ou son acc\u00e9l\u00e9ration.<\/p>\n<\/div>\n

Neptune semble \u00eatre la s\u0153ur jumelle d'Uranus, tant la ressemblance est forte. Elle est 57 fois plus grosse que la Terre et tourne relativement vite sur elle-m\u00eame : un jour sur Neptune ne dure que 16 heures 7 minutes. Sa distance moyenne du Soleil est d'environ 4 500 millions de km et une ann\u00e9e sur Neptune \u00e9quivaut \u00e0 presque 165 ann\u00e9es terrestres.<\/p>\n

Comme Uranus, elle poss\u00e8de une atmosph\u00e8re compos\u00e9e d'hydrog\u00e8ne, d'h\u00e9lium et de m\u00e9thane. Elle dispose probablement d'un noyau rocheux envelopp\u00e9 dans un manteau de glace. Bien que l'atmosph\u00e8re soit tr\u00e8s froide(-220\u00b0C), la plan\u00e8te bleue est le si\u00e8ge de vents tr\u00e8s violents et de temp\u00eates. Voyager 2 a observ\u00e9 une \u00e9norme tache, de la taille de la Terre.<\/p>\n

Neptune poss\u00e8de au moins cinq anneaux \u00e9troits et sombres (qui portent le nom de Galle, Le Verrier, Adams et d'autres scientifiques dont les travaux ont contribu\u00e9 \u00e0 la d\u00e9couverte de la plan\u00e8te).<\/p>\n

On lui conna\u00eet 13 lunes. La plus grosse est de loin Triton, un monde glac\u00e9 plus grand que Pluton. Triton est tr\u00e8s froide, de sorte que sa fine atmosph\u00e8re a gel\u00e9 sur sa surface. On observe toutefois de nombreux volcans en activit\u00e9 d'o\u00f9 jaillissent des gerbes de gaz et de poussi\u00e8re. Triton est \u00e9galement \u00e9trange parce qu'elle tourne \" \u00e0 l'envers \" (d'est en ouest) autour de Neptune. On pense que Triton aurait \u00e9t\u00e9 captur\u00e9e par Neptune, il y a tr\u00e8s longtemps.<\/p>","protected":false},"excerpt":{"rendered":"

Neptune was discovered in 1846 by Johann Galle, an astronomer at the Berlin Observatory. Galle knew where to look because of calculations by French mathematician Urbain Le Verrier. Both Le […]<\/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\/2000\/12\/neptune2\/17866082-3-eng-GB\/Neptune.jpg","esa_banner_description":"Neptune","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2000\/12\/Neptune2","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":[10,11,12],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1106","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1106","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=1106"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1106\/revisions"}],"predecessor-version":[{"id":2249,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1106\/revisions\/2249"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1106"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1106"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1106"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1106"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1106"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1106"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1106"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1106"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1106"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1106"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}