{"id":10451,"date":"2021-06-22T06:26:35","date_gmt":"2021-06-22T06:26:35","guid":{"rendered":"https:\/\/snipool.com\/?p=10451"},"modified":"2021-06-22T06:26:35","modified_gmt":"2021-06-22T06:26:35","slug":"les-astres","status":"publish","type":"post","link":"https:\/\/snipool.com\/fr\/les-astres\/","title":{"rendered":"Les astres"},"content":{"rendered":"

Astre<\/em> d\u00e9signe un corps c\u00e9leste lumineux par lui- m\u00eame ou qui emprunte la clart\u00e9 d\u2019un autre corps. Le Soleil, notre Lune, les plan\u00e8tes de roches ou de gaz, les ast\u00e9ro\u00efdes, les com\u00e8tes, les satellites, ainsi les \u00e9toiles de la Voie lact\u00e9e, sont des astres c\u00e9lestes.<\/p>\n

Pour qu\u2019un astre soit une plan\u00e8te, il faut qu\u2019il tourne, on dit encore qu\u2019il gravite ou qu\u2019il est en orbite autour du Soleil et qu\u2019il ait une certaine taille. Il y a des millions de petits cailloux et de gros rochers qui gravitent autour du Soleil. Mais ils sont trop petits et on les appelle astero<\/em>\u00ef<\/em>des<\/em>. Le plus gros astero\u00efde a un diam\u00e8tre d\u2019environ 1 000 km, les plus petits qu\u2019on puisse observer ont des diam\u00e8tres de 1 \u00e0 2 km. Les astero\u00efdes sont faits de roches, ou de m\u00e9tal, ou des deux. Ils gravitent autour du Soleil et on les trouve dans une r\u00e9gion appel\u00e9e la ceinture\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/em>d\u2019 astero<\/em>\u00ef<\/em>des<\/em>, situ\u00e9e entre Mars et Jupiter. Quatre astero\u00efdes ont \u00e9t\u00e9 survol\u00e9s de pr\u00e8s par des sondes\u00a0: Gaspra, Ida (elle poss\u00e8de m\u00eame une minuscule lune), Mathilde et Eros. L\u2019astero\u00efde Cl\u00e9op\u00e2tre, observ\u00e9e par des observations radar et traitement informatique, a r\u00e9v\u00e9l\u00e9 sa forme bizarre\u00a0: elle ressemble \u00e0 un os.<\/p>\n

Les com\u00e8tes sont d\u2019autres corps c\u00e9l\u00e8stes qui tournent autout du Soleil. Les com\u00e8tes ont une trajectoire plus importante que celle des plan\u00e8tes. Leurs noyaux, form\u00e9s de gaz conglel\u00e9s et de d\u00e9bris min\u00e9raux, ont des dimensions entre 1 \u00e0 50 km. Une com\u00e8te est une boule de quelques kilom\u00e8tres, form\u00e9e de neige, de cailloux et de poussi\u00e8res. En temps normal, les com\u00e8tes gravitent dans la zone glaciale de la banlieue du syst\u00e8me solaire, au- del\u00e0 des plan\u00e8tes g\u00e9antes. Mais parfois, une com\u00e8te peut se rapprocher du Soleil et sa boule de neige est surchauff\u00e9e. Elle se met alors \u00e0 cracher de gaz et de poussi\u00e8re. Ces jets forment la chevelure<\/em> de la com\u00e8te et les vapeurs, emport\u00e9es par sa course autour du Soleil forment la queue<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Astre d\u00e9signe un corps c\u00e9leste lumineux par lui- m\u00eame ou qui emprunte la clart\u00e9 d\u2019un autre corps. Le Soleil, notre Lune, les plan\u00e8tes de roches ou de gaz, les ast\u00e9ro\u00efdes, les com\u00e8tes, les satellites, ainsi les \u00e9toiles de la Voie lact\u00e9e, sont des astres c\u00e9lestes. Pour qu\u2019un astre soit une plan\u00e8te, il faut qu\u2019il tourne, …<\/p>\n","protected":false},"author":1,"featured_media":10452,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1088],"tags":[2805,2803,2802,2804],"class_list":["post-10451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interessant","tag-comete","tag-le-soleil","tag-les-astres","tag-lune"],"yoast_head":"\nLes astres - Snipool<\/title>\n<meta name=\"description\" content=\"Astre d\u00e9signe un corps c\u00e9leste lumineux par lui- m\u00eame ou qui emprunte la clart\u00e9 d\u2019un autre corps. 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