{"id":20986,"date":"2023-10-19T13:03:47","date_gmt":"2023-10-19T13:03:47","guid":{"rendered":"https:\/\/snipool.com\/?p=20986"},"modified":"2023-10-19T13:03:47","modified_gmt":"2023-10-19T13:03:47","slug":"les-planetes-de-notre-systeme-solaire-partie-1","status":"publish","type":"post","link":"https:\/\/snipool.com\/fr\/les-planetes-de-notre-systeme-solaire-partie-1\/","title":{"rendered":"Les plan\u00e8tes de notre syst\u00e8me solaire, partie 1"},"content":{"rendered":"<p>Neuf plan\u00e8tes de notre syst\u00e8me gravitent autour du Soleil\u00a0: Mercure, V\u00e9nus, la Terre, Mars, Jupiter, Saturne, Uranus, Neptune et Pluton.<\/p>\n<p>Toutes les plan\u00e8tes (\u00e0 l\u2019exception de V\u00e9nus) tournent autour du Soleil dans le m\u00eame sens, et aussi sur elles- m\u00eames comme des toupies. Plus elles sont loin du Soleil, plus elles mettent de temps pour faire le tour complet autour de lui. Mars met un quart d\u2019ann\u00e9e terrestre pour effectuer le tour, et Pluton 250 ans!<\/p>\n<p>Quatres plan\u00e8tes sont de vraies G\u00e9antes car elles ont des tailles \u00e9normes\u00a0: Neptune, Uranus, Saturne et Jupiter. Ce sont d\u2019immenses boules de gaz et pour cette raison on les appelle les \u00ab\u00a0plan\u00e8tes gazeuses\u00a0\u00bb. Les atmosph\u00e8res des quatre g\u00e9antes sont turbulentes. Elles sont compos\u00e9es de gaz, mais surtout d\u2019hydrog\u00e8ne, l\u2019\u00e9l\u00e9ment le plus l\u00e9ger existant et un peu d\u2019h\u00e9lium. Les nuages, qui enveloppent les g\u00e9antes, sont charg\u00e9s de m\u00e9thane et d\u2019ammoniac, deux gaz toxiques pour l\u2019homme.<\/p>\n<p>Sur <strong>Saturne<\/strong>, le vent peut souffler \u00e0 1 400 km\/h. Cette plan\u00e8te ressemble beaucoup \u00e0 Jupiter, mais elle est un peu plus petite. La plan\u00e8te chauffe de l\u2019int\u00e9rieur, son atmosph\u00e8re est tr\u00e8s agit\u00e9e et en 1990 une gigantesque temp\u00eate a d\u00e9vast\u00e9 son \u00e9quateur.<\/p>\n<p><strong>Jupiter<\/strong> est la plus grande plan\u00e8te du syst\u00e8me solaire. La Grande tache rouge, visible dans son h\u00e9misph\u00e8re Sud, est un gigantesque ouragan. La plan\u00e8te pivote sur elle- m\u00eame \u00e0 grande vitesse et fait un tour en 10 heures. Le mouvement entra\u00eene ses nuages et les \u00e9tire en longues bandes parall\u00e8les \u00e0 son \u00e9quateur. C\u2019est pourquoi la plan\u00e8te est \u201eray\u00e9e\u201c.<\/p>\n<p><strong>Neptune<\/strong> est une plan\u00e8te bleue, mais cette couleur est d\u00fbe \u00e0 un gaz, le m\u00e9thane et pas \u00e0 l\u2019eau. Neptune ressemble beaucoup \u00e0 Uranus par sa taille. Mais la plan\u00e8te chauffe de l\u2019int\u00e9rieur et son atmosph\u00e8re est tr\u00e8s agit\u00e9e par des vents violents. Un immense ouragan, connu sous le nom de \u201egrande tache sombre\u201c, est apparu dans son atmosph\u00e8re pendant un temps. Cette tache a aujourd\u2019hui disparu\u00a0: l\u2019ouragan s\u2019est calm\u00e9.<\/p>\n<p><strong>Uranus<\/strong> tourne sur lui- m\u00eame en 17 heures et met 84 ans pour faire le tour autour du Soleil. La plan\u00e8te est quatre fois plus grande que la Terre. Uranus ne chauffe pas de l\u2019int\u00e9rieur et son atmosph\u00e8re est moins \u00e9paisse que celle des autres g\u00e9antes. La plan\u00e8te a une particularit\u00e9\u00a0: elle est pench\u00e9e et pratiquement couch\u00e9e sur sa trajectoire. Elle ne tourne pas sur elle- m\u00eame comme une toupie mais \u201eroule\u201c \u00e0 la mani\u00e8re d\u2019une boule et son axe est presque dans le plan de sa trajectoire.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Neuf plan\u00e8tes de notre syst\u00e8me gravitent autour du Soleil\u00a0: Mercure, V\u00e9nus, la Terre, Mars, Jupiter, Saturne, Uranus, Neptune et Pluton. Toutes les plan\u00e8tes (\u00e0 l\u2019exception de V\u00e9nus) tournent autour du Soleil dans le m\u00eame sens, et aussi sur elles- m\u00eames comme des toupies. Plus elles sont loin du Soleil, plus elles mettent de temps pour &hellip;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1080],"tags":[6612,2819,3377,6610,3106,6611,6613,4743,2813,2817],"class_list":["post-20986","post","type-post","status-publish","format-standard","hentry","category-science-fr","tag-geantes","tag-jupiter","tag-la-terre","tag-les-planetes-de-notre-systeme-solaire","tag-neptune","tag-notre-systeme-solaire","tag-ouragan","tag-planetes","tag-saturne","tag-uranus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les plan\u00e8tes de notre syst\u00e8me solaire, partie 1 - Snipool<\/title>\n<meta name=\"description\" content=\"Neuf plan\u00e8tes de notre syst\u00e8me gravitent autour du Soleil\u00a0: Mercure, V\u00e9nus, la Terre, Mars, Jupiter,\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/snipool.com\/fr\/les-planetes-de-notre-systeme-solaire-partie-1\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les plan\u00e8tes de notre syst\u00e8me solaire, partie 1 - 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