{"id":5946,"date":"2023-02-27T15:14:16","date_gmt":"2023-02-27T15:14:16","guid":{"rendered":"https:\/\/www.africa-press.net\/guinee-equatoriale\/politique\/quelle-est-la-taille-de-lunivers"},"modified":"2023-02-27T16:13:05","modified_gmt":"2023-02-27T16:13:05","slug":"quelle-est-la-taille-de-lunivers","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/guinee-equatoriale\/toutes-les-actualites\/quelle-est-la-taille-de-lunivers","title":{"rendered":"Quelle est la taille de l\u2019univers ?"},"content":{"rendered":"

Africa-Press – Guinee Equatoriale. <\/strong><\/span>Notre univers ne se limite pas a\u0300 la Voie lacte\u0301e ! Mais alors, quelle est sa taille ? Est-il fini ou infini ? Pour re\u0301pondre a\u0300 ces questions, revenons sur ce que nous savons.<\/p>\n

La the\u0301orie de la relativite\u0301 ge\u0301ne\u0301rale d\u2019Einstein nous a appris que l\u2019espace-temps pouvait se de\u0301former comme une membrane e\u0301lastique. La the\u0301orie du Big Bang, bien confirme\u0301e par l\u2019expe\u0301rience et de\u0301coulant de la the\u0301orie d\u2019Einstein, nous indique que l\u2019espace est en expansion. Cette the\u0301orie est compatible avec l\u2019ide\u0301e que notre univers est une sorte de bulle de taille finie qui gonfle, mais aussi avec l\u2019ide\u0301e que cet univers e\u0301tait de\u0301ja\u0300 de taille infinie au moment ou\u0300 a commence\u0301 son expansion.<\/p>\n

Cette dernie\u0300re ide\u0301e semble paradoxale mais elle est mathe\u0301matiquement cohe\u0301rente. On peut aussi penser que seule une petite portion de cet univers infini est entre\u0301e en expansion a\u0300 un moment donne\u0301 de son histoire.<\/p>\n

Un fabuleux voyage a\u0300 travers l\u2019univers observable de la Terre jusqu\u2019a\u0300 la sphe\u0300re de dernie\u0300re diffusion dont nous parviennent aujourd\u2019hui les plus vieux photons de l\u2019univers. Toutes les distances sont a\u0300 l\u2019e\u0301chelle et les objets sont repre\u0301sente\u0301s avec le plus d\u2019exactitude possible. \u00a9 Digital Universe, American Museum of Natural History, YouTube ; musique : Suke Cerulo<\/p>\n

Taille de l\u2019univers et rayonnement fossile<\/b><\/p>\n

En toute rigueur, tout ce que l\u2019on peut dire c\u2019est qu\u2019au moins une portion spatiale d\u2019un espace-temps s\u2019est mis en expansion avec une vitesse de\u0301passant celle de la lumie\u0300re il y a 13,7 milliards d\u2019anne\u0301es, avant de le faire a\u0300 un rythme moins rapide bien avant sa premie\u0300re seconde d\u2019existence. De sorte que les re\u0301gions dont nous parvient aujourd\u2019hui le fameux rayonnement fossile, les plus lointaines observables, sont a\u0300 une distance d\u2019environ 45,6 milliards d\u2019anne\u0301es-lumie\u0300re actuellement.<\/p>\n

Il faut bien comprendre que cette affirmation n\u2019est pas paradoxale car si ni la lumie\u0300re ni la matie\u0300re ne peuvent de\u0301passer la vitesse d\u2019environ 300.000 km\/s dans l\u2019espace, rien n\u2019empe\u0302che l\u2019espace entre deux objets de se dilater a\u0300 une vitesse bien supe\u0301rieure.<\/p>\n

Au final, la seule chose que nous sachions est que la taille de l\u2019univers observable est d\u2019au moins quelques dizaines de milliards d\u2019anne\u0301es-lumie\u0300re mais nous ne savons pas si l\u2019univers total lui-me\u0302me est fini, comme le pensent Stephen Hawking et Jean-Pierre Luminet, ou infini comme le pensent Roger Penrose et d\u2019autres chercheurs.<\/p>\n

Pour plus d’informations et d’analyses sur la Guinee Equatoriale<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Guinee Equatoriale. Notre univers ne se limite pas a\u0300 la Voie lacte\u0301e ! Mais alors, quelle est sa taille ? Est-il fini ou infini ? Pour re\u0301pondre a\u0300 ces questions, revenons sur ce que nous savons. La the\u0301orie de la relativite\u0301 ge\u0301ne\u0301rale d\u2019Einstein nous a appris que l\u2019espace-temps pouvait se de\u0301former comme une […]<\/p>\n","protected":false},"author":82,"featured_media":5945,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-5946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-guinee-equatoriale","tag-guinee-equatoriale"],"yoast_head":"\nQuelle est la taille de l\u2019univers ? - Guin\u00e9e \u00e9quatoriale<\/title>\n<meta name=\"description\" content=\"Notre univers ne se limite pas a\u0300 la Voie lacte\u0301e ! Mais alors, quelle est sa taille ? Est-il fini ou infini ? 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