{"id":195,"date":"2021-12-02T12:44:42","date_gmt":"2021-12-02T11:44:42","guid":{"rendered":"https:\/\/kids.esa.int\/galaxies\/"},"modified":"2026-10-08T00:25:21","modified_gmt":"2026-10-07T22:25:21","slug":"galaxies","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/galaxies\/","title":{"rendered":"Les galaxies"},"content":{"rendered":"
\n

Presque toutes les \u00e9toiles appartiennent \u00e0 des groupes gigantesques appel\u00e9s galaxies. Le Soleil est l'une des quelques 100 milliards d'\u00e9toiles qui composent notre galaxie, la Voie Lact\u00e9e. Et il existe des milliards de galaxies dans l'Univers.<\/p>\n<\/div>\n

O\u00f9 que nous regardions dans le ciel, il existe des galaxies de diff\u00e9rentes formes et de diff\u00e9rentes tailles. Certaines sont en spirales, les bras enveloppant un noyau central brillant.<\/p>\n

D'autres comportent une barre d'\u00e9toiles \u00e0 travers le centre, avec des bras \u00e0 chaque extr\u00e9mit\u00e9. D'autres encore n'ont aucune forme reconnaissable. Les plus grandes galaxies ont la forme de ballons aplatis. Elles contiennent jusqu'\u00e0 10 millions de millions d'\u00e9toiles mais elles ne renferment que tr\u00e8s peu de gaz ou de poussi\u00e8re. Presque toutes les galaxies ont un trou noir super massif au centre.<\/p>\n

\"When
Lorsque des galaxies entrent en collision, comme le montrent les galaxies des Antennes<\/figcaption><\/figure>\n

Les galaxies sont n\u00e9es seulement quelques centaines de millions d\u2019ann\u00e9es apr\u00e8s la cr\u00e9ation de l'Univers. A cette \u00e9poque, il y a environ 13 milliards d'ann\u00e9es, les galaxies \u00e9taient petites et beaucoup plus proches les unes des autres. Les collisions \u00e9taient chose courante. A mesure que les galaxies se percutaient, elles augmentaient en taille et changeaient de forme.<\/p>\n

Depuis, l'Univers est en expansion. La plupart des galaxies s'\u00e9loignent les unes des autres \u00e0 grande vitesse, sauf dans les amas galactiques o\u00f9 elles dansent les unes autour des autres.<\/p>","protected":false},"excerpt":{"rendered":"

Nearly all stars belong to gigantic groups known as galaxies. The Sun is one of at least 100 billion stars in our galaxy, the Milky Way. And there are billions […]<\/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\/04\/spiral_galaxy_ngc_12322\/17874740-2-eng-GB\/Spiral_galaxy_NGC_1232.jpg","esa_banner_description":"Spiral galaxy NGC 1232","esa_banner_credit":"Spaceweek International","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/04\/Spiral_galaxy_NGC_12322","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":[10,11,21],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-195","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/195","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=195"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/195\/revisions"}],"predecessor-version":[{"id":4351,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/195\/revisions\/4351"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=195"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=195"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=195"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=195"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=195"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=195"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=195"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}