{"id":1107,"date":"2006-01-19T10:51:00","date_gmt":"2006-01-19T09:51:00","guid":{"rendered":"https:\/\/kids.esa.int\/uranus\/"},"modified":"2026-10-08T00:36:04","modified_gmt":"2026-10-07T22:36:04","slug":"uranus","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/uranus\/","title":{"rendered":"Uranus"},"content":{"rendered":"
\n

Uranus est la septi\u00e8me plan\u00e8te \u00e0 partir du Soleil. Elle a \u00e9t\u00e9 d\u00e9couverte par William Herschel en 1781.<\/p>\n<\/div>\n

Sa distance moyenne du Soleil est sup\u00e9rieure \u00e0 2 800 millions de kilom\u00e8tres. \u00c0 cette distance, la temp\u00e9rature au sommet de ses nuages est de -214 degr\u00e9s C. Il lui faut 84 ans pour compl\u00e9ter son orbite autour du Soleil \u00e0 cause de sa lenteur et de la distance \u00e0 parcourir.<\/p>\n

Uranus est une plan\u00e8te g\u00e9ante, la troisi\u00e8me plus grosse plan\u00e8te de notre syst\u00e8me solaire (elle correspond \u00e0 64 Terres). Malgr\u00e9 sa taille, elle tourne rapidement sur elle-m\u00eame. Un jour sur Uranus ne dure que 17 heures 14 minutes.<\/p>\n

La rotation d'Uranus ressemble \u00e0 celle d'une toupie couch\u00e9e sur un c\u00f4t\u00e9. Il en r\u00e9sulte que le Soleil est parfois juste au-dessus des p\u00f4les. Chaque p\u00f4le a un \u00e9t\u00e9 et un hiver de 21 ans, en devenant tour \u00e0 tour les points les plus chauds et les plus froids de la plan\u00e8te !<\/p>\n

Quand la sonde Voyager 2 a visit\u00e9 Uranus en 1986, presqu'aucun nuage n'\u00e9tait visible. Toutefois, de r\u00e9centes images prises par le t\u00e9lescope spatial Hubble ont montr\u00e9 des gigantesques temp\u00eates.<\/p>\n

Les principaux gaz dans cette \u00e9paisse atmosph\u00e8re sont l'hydrog\u00e8ne et l'h\u00e9lium, avec un peu de m\u00e9thane (la couleur bleue d'Uranus est due \u00e0 la pr\u00e9sence de m\u00e9thane qui r\u00e9fl\u00e9chit le bleu). Mais Uranus ne ressemble pas \u00e0 Jupiter ni \u00e0 Saturne.<\/p>\n

Uranus est essentiellement form\u00e9e de \" glaces \" (un m\u00e9lange d'eau, de m\u00e9thane et d'ammoniac). Elle pourrait contenir un petit noyau rocheux, qui expliquerait la faible masse de la plan\u00e8te par rapport \u00e0 sa taille.<\/p>\n

Uranus poss\u00e8de 27 lunes connues. Aucune d'entre elles n'est tr\u00e8s grosse. Les plus gros satellites d'Uranus, de plus de 1 500 km de diam\u00e8tre, sont Oberon et Titania.<\/p>\n

Uranus poss\u00e8de \u00e9galement une douzaine d'anneaux sombres, faits de poussi\u00e8res. La plupart sont extr\u00eamement fins. Leur forme est maintenue par la proximit\u00e9 des satellites \" bergers \". Au moins un anneau a \u00e9t\u00e9 cr\u00e9\u00e9 par des m\u00e9t\u00e9orites s'\u00e9crasant dans un petit satellite.<\/p>","protected":false},"excerpt":{"rendered":"

Uranus is the seventh planet from the Sun. It was discovered by William Herschel in 1781. Uranus lies more than 2,800 million km from the Sun. At this distance, the […]<\/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\/2003\/05\/uranus2\/17876812-2-eng-GB\/Uranus.jpg","esa_banner_description":"Uranus","esa_banner_credit":"DLR","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/05\/Uranus2","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1107","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1107","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=1107"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1107\/revisions"}],"predecessor-version":[{"id":2250,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1107\/revisions\/2250"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1107"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1107"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1107"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1107"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1107"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1107"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1107"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1107"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1107"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}