{"id":165432,"date":"2020-02-12T08:59:02","date_gmt":"2020-02-12T07:59:02","guid":{"rendered":"https:\/\/www.realites.com.tn\/?p=165432"},"modified":"2020-02-12T08:59:02","modified_gmt":"2020-02-12T07:59:02","slug":"un-mysterieux-signal-radio-venu-de-lespace-intrigue-les-scientifiques","status":"publish","type":"post","link":"https:\/\/realites.com.tn\/fr\/un-mysterieux-signal-radio-venu-de-lespace-intrigue-les-scientifiques\/","title":{"rendered":"Un myst\u00e9rieux signal radio venu de l\u2019espace intrigue les scientifiques"},"content":{"rendered":"<div dir=\"ltr\"><span style=\"text-transform: initial\">Le signal radio, rep\u00e9r\u00e9 par des scientifiques au Canada, se r\u00e9p\u00e8te de mani\u00e8re r\u00e9guli\u00e8re. Son origine est pour le moment inconnue.<\/span><\/div>\n<div dir=\"ltr\">\n<div>Ce n\u2019est pas le premier \u00ab\u00a0sursaut radio rapide\u00a0\u00bb rep\u00e9r\u00e9 par des scientifiques, mais c\u2019est le plus surprenant. Pour la premi\u00e8re fois, des chercheurs ont pu observer un signal radio se r\u00e9p\u00e9ter de mani\u00e8re r\u00e9guli\u00e8re, gr\u00e2ce \u00e0 un t\u00e9lescope au Canada, rapporte le quotidien anglais The Independent.<\/div>\n<div>Ces \u00ab\u00a0sursauts radio rapides\u00a0\u00bb, ou FRB pour \u00ab\u00a0Fast radio burst\u00a0\u00bb, ne sont pas inhabituels. Depuis qu\u2019on a commenc\u00e9 \u00e0 les d\u00e9celer en 2007, plus d\u2019une soixantaine a pu \u00eatre observ\u00e9e. Il s\u2019agit d\u2019un ensemble concentr\u00e9 d\u2019ondes radio visible pendant quelques millisecondes \u00e0 peine. Un flash d&rsquo;une milliseconde \u00e9met la m\u00eame quantit\u00e9 d&rsquo;\u00e9nergie que le Soleil en 10.000 ans.<\/div>\n<div>La r\u00e9p\u00e9tition d\u2019un de ces \u00ab\u00a0sursauts radio rapide\u00a0\u00bb est certes atypique, mais pas nouvelle. Pendant l\u2019\u00e9t\u00e9 2019, ce m\u00eame t\u00e9lescope canadien nomm\u00e9 CHIME en avait d\u00e9tect\u00e9 une. C\u2019\u00e9tait alors la deuxi\u00e8me d\u00e9tection de ce genre.<\/div>\n<div>La nouveaut\u00e9 cette fois, et ce qui interpelle les scientifiques, c\u2019est la r\u00e9gularit\u00e9 de la r\u00e9p\u00e9tition, sa pr\u00e9visibilit\u00e9. Le signal radio appara\u00eet toutes les heures et de mani\u00e8re intense pendant quatre jours, avant de dispara\u00eetre pendant douze jours. Puis ce cycle de seize jours se r\u00e9p\u00e8te. Cette r\u00e9gularit\u00e9 est \u201cun indice important quant \u00e0 la nature de cet objet\u201d, indiquent les chercheurs, dans un article scientifique publi\u00e9 sur le site ArXiv.<\/div>\n<div><\/div>\n<div><strong>*Une origine encore inconnue<\/strong><\/div>\n<div>Les scientifiques ont du mal \u00e0 \u00e9tablir l\u2019origine pr\u00e9cise de ce signal radio. Une chose est s\u00fbre: il ne vient pas de notre syst\u00e8me solaire. Il viendrait d\u2019une galaxie massive, situ\u00e9e \u00e0 plus de 500 millions d\u2019ann\u00e9es-lumi\u00e8re de la n\u00f4tre.<\/div>\n<div>Les astronomes ne savent pas non plus expliquer l\u2019origine des FRB. Certains ont avanc\u00e9 l\u2019hypoth\u00e8se de messages extraterrestres, d\u2019autres pensent \u00e0 une \u00e9toile disparaissant dans un trou noir. Mais la r\u00e9p\u00e9tition de ces sursauts rend peu probables de telles causes.<\/div>\n<div>D\u2019apr\u00e8s les scientifiques, la pr\u00e9visibilit\u00e9 de la r\u00e9p\u00e9tition indique plut\u00f4t que l\u2019objet en question vient d\u2019un syst\u00e8me binaire, c\u2019est-\u00e0-dire d\u2019un syst\u00e8me organis\u00e9 autour de deux astres semblables au Soleil. D\u2019autres objets dans l\u2019espace ont pr\u00e9sent\u00e9 des caract\u00e9ristiques similaires et se situent dans ce type de syst\u00e8mes. Il pourrait par exemple tourner autour d\u2019une \u00e9toile, le signal serait alors visible lorsque l\u2019objet fait face \u00e0 la Terre.<\/div>\n<div>Cette d\u00e9couverte reste tr\u00e8s myst\u00e9rieuse, mais va permettre aux scientifiques d\u2019en apprendre davantage sur les \u00ab\u00a0sursauts radio rapides\u00a0\u00bb et un jour peut-\u00eatre d\u2019expliquer ce ph\u00e9nom\u00e8ne.<\/div>\n<div dir=\"ltr\" style=\"text-align: right\">(BFM TV)<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le signal radio, rep\u00e9r\u00e9 par des scientifiques au Canada, se r\u00e9p\u00e8te de mani\u00e8re r\u00e9guli\u00e8re. Son origine est pour le moment inconnue. Ce n\u2019est pas le premier \u00ab\u00a0sursaut radio rapide\u00a0\u00bb rep\u00e9r\u00e9&hellip;<\/p>\n","protected":false},"author":60,"featured_media":165433,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-165432","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monde"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un myst\u00e9rieux signal radio venu de l\u2019espace intrigue les scientifiques - R\u00e9alit\u00e9s Magazine<\/title>\n<meta name=\"description\" content=\"Le signal radio, rep\u00e9r\u00e9 par des scientifiques au Canada, se r\u00e9p\u00e8te de mani\u00e8re r\u00e9guli\u00e8re. Son origine est pour le moment inconnue. 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