{"id":87580,"date":"2024-05-29T15:58:48","date_gmt":"2024-05-29T15:58:48","guid":{"rendered":"https:\/\/www.africa-press.net\/burkina-faso\/politique\/euclid-decouvre-de-nouvelles-planetes-sans-etoile"},"modified":"2024-05-29T17:01:11","modified_gmt":"2024-05-29T17:01:11","slug":"euclid-decouvre-de-nouvelles-planetes-sans-etoile","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile","title":{"rendered":"Euclid d\u00e9couvre de nouvelles plan\u00e8tes sans \u00e9toile"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Burkina Faso. <\/strong><\/span>Le te\u0301lescope spatial europe\u0301en Euclid a de\u0301couvert sept nouvelles plane\u0300tes orphelines, des mondes solitaires errant dans l&rsquo;espace interstellaire, sans lien avec une e\u0301toile.<\/p>\n<p><b>\u00ab\u00a0Pointe de l&rsquo;iceberg\u00a0\u00bb<\/b><\/p>\n<p>A la diffe\u0301rence de la Terre ces astres ne connaissent ni jour ou nuit, ni mois ou anne\u0301es. Pourtant des scientifiques pensent que certains pourraient abriter une forme de vie, et se compter en milliards de milliards dans la galaxie. La de\u0301couverte des nouvelles plane\u0300tes orphelines a e\u0301te\u0301 faite le 24 mai, dans une e\u0301tude scientifique en pre\u0301publication sur arXiv.org, au lendemain de l&rsquo;annonce d&rsquo;une nouvelle moisson d&rsquo;images et de donne\u0301es d&rsquo;Euclid.<\/p>\n<p>Ces plane\u0300tes errantes, des ge\u0301antes gazeuses ayant chacune une masse d&rsquo;au moins quatre fois celle de Jupiter, ont e\u0301te\u0301 de\u0301couvertes dans la ne\u0301buleuse d&rsquo;Orion, une pouponnie\u0300re d&rsquo;e\u0301toiles situe\u0301e a\u0300 environ 1.500 anne\u0301es-lumie\u0300re de la Terre. Elles sont juste \u00ab\u00a0la pointe de l&rsquo;iceberg\u00a0\u00bb, a dit a\u0300 l&rsquo;AFP l&rsquo;astronome espagnol Eduardo Martin, premier auteur de l&rsquo;e\u0301tude. Mais les trouver e\u0301quivaut a\u0300 \u00ab\u00a0chercher une aiguille dans une meule de foin\u00a0\u00bb, selon lui, car elles ne refle\u0300tent pas la lumie\u0300re d&rsquo;une e\u0301toile proche. Les sept plane\u0300tes observe\u0301es par Euclid avaient l&rsquo;avantage d&rsquo;e\u0302tre pluto\u0302t chaudes et donc de produire un rayonnement facilitant leur de\u0301couverte.<\/p>\n<p><b>Pas si seules<\/b><\/p>\n<p>Euclid, lance\u0301 dans l&rsquo;espace en 2023, a aussi confirme\u0301 l&rsquo;existence de dizaines d&rsquo;autres plane\u0300tes orphelines, de\u0301tecte\u0301es ante\u0301rieurement. Des recherches ont sugge\u0301re\u0301 que pour chaque e\u0301toile on compterait environ 20 plane\u0300tes errantes, n&rsquo;appartenant a\u0300 aucun syste\u0300me stellaire. Ce qui en ferait des milliards de milliards dans la Voie lacte\u0301e, et un nombre incalculable a\u0300 l&rsquo;e\u0301chelle de l&rsquo;Univers. Le lancement en 2027 de Roman, le te\u0301lescope spatial de la Nasa, pourrait aider a\u0300 en pre\u0301ciser le nombre.<\/p>\n<p>Ces mondes e\u0301tranges e\u0301voquent pour Gavin Coleman, astronome a\u0300 l&rsquo;Universite\u0301 Queen Mary de Londres, un \u00ab\u00a0sentiment d&rsquo;e\u0301merveillement de myste\u0300re\u00a0\u00bb. \u00ab\u00a0Nous avons tous grandi avec la vision du Soleil dans le ciel, ce qui rend fascinant de penser a\u0300 une plane\u0300te de\u0301rivant dans l&rsquo;espace sans e\u0301toile a\u0300 l&rsquo;horizon\u00a0\u00bb, a-t-il dit a\u0300 l&rsquo;AFP.<\/p>\n<p>Certaines ne sont pourtant pas si seules. Sur les plus de 20 plane\u0300tes orphelines confirme\u0301es par Euclid, au moins quatre seraient des plane\u0300tes binaires, c&rsquo;est-a\u0300-dire en orbite l&rsquo;une avec l&rsquo;autre. Selon Eduardo Martin, \u00ab\u00a0certains de nos voisins les plus proches sont sans doute des plane\u0300tes orphelines\u00a0\u00bb. Sans le be\u0301ne\u0301fice des rayons d&rsquo;un soleil proche, ces astres sont re\u0301pute\u0301s extre\u0302mement froids, avec une surface sans doute glace\u0301e.<\/p>\n<p><b>Des formes de vie ?<\/b><\/p>\n<p>La chaleur indispensable au soutien d&rsquo;une forme de vie devrait donc venir de leurs entrailles. Un bon exemple en est Neptune, une ge\u0301ante de glace dont la tempe\u0301rature de surface provient essentiellement de l&rsquo;e\u0301nergie de son noyau. Mais me\u0302me dans les meilleures conditions, cet isolement extre\u0302me ne pourrait autoriser que des formes de vie bacte\u0301rienne ou microbiennes, selon Gavin Coleman. Comme celles florissant au fond des oce\u0301ans terrestres pre\u0300s des e\u0301vents ge\u0301othermiques, dans l&rsquo;obscurite\u0301 la plus comple\u0300te.<\/p>\n<p>Cette existence solitaire n&rsquo;est peut-e\u0302tre pas si nocive. Car \u00ab\u00a0la proximite\u0301 d&rsquo;une e\u0301toile a ses inconve\u0301nients\u00a0\u00bb, a remarque\u0301 le cosignataire de l&rsquo;e\u0301tude Christopher Conselice, professeur d&rsquo;astronomie extragalactique a\u0300 l&rsquo;Universite\u0301 britannique de Manchester. Comme ce qui attend la Terre, quand elle sera calcine\u0301e ou absorbe\u0301e d&rsquo;ici 7,6 milliards d&rsquo;anne\u0301es par un Soleil ayant mue\u0301 en ge\u0301ante rouge. Les plane\u0300tes orphelines n&rsquo;ont pas ce souci. \u00ab\u00a0Ces objets vivront pour toujours\u00a0\u00bb, a dit le Pr. Conselice a\u0300 l&rsquo;AFP: \u00ab\u00a0Si les tempe\u0301ratures glace\u0301es ne vous de\u0301rangent pas, vous pourriez y survivre e\u0301ternellement\u00a0\u00bb.<\/p>\n<p>L&rsquo;e\u0301tude re\u0301alise\u0301e gra\u0302ce aux donne\u0301es d&rsquo;Euclid a sugge\u0301re\u0301e des pistes sur la formation des plane\u0300tes orphelines. Certaines pourraient se former aux frontie\u0300res d&rsquo;un syste\u0300me stellaire avant de s&rsquo;en de\u0301tacher pour flotter en solitaire. Mais l&rsquo;e\u0301tude pre\u0301voit que bon nombre apparaitraient comme des \u00ab\u00a0sous-produits naturels\u00a0\u00bb de la formation d&rsquo;e\u0301toiles, selon M. Conselice. Il pourrait exister \u00ab\u00a0une connexion tre\u0300s forte entre e\u0301toiles et plane\u0300tes a\u0300 travers le processus de leur formation\u00a0\u00bb, selon lui.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/burkina-faso\">Burkina Faso<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Burkina Faso. Le te\u0301lescope spatial europe\u0301en Euclid a de\u0301couvert sept nouvelles plane\u0300tes orphelines, des mondes solitaires errant dans l&rsquo;espace interstellaire, sans lien avec une e\u0301toile. \u00ab\u00a0Pointe de l&rsquo;iceberg\u00a0\u00bb A la diffe\u0301rence de la Terre ces astres ne connaissent ni jour ou nuit, ni mois ou anne\u0301es. Pourtant des scientifiques pensent que certains pourraient [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":87579,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[111,725,29],"class_list":["post-87580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-burkina-faso","tag-burkina-faso"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Euclid d\u00e9couvre de nouvelles plan\u00e8tes sans \u00e9toile - Burkina Faso<\/title>\n<meta name=\"description\" content=\"Le te\u0301lescope spatial europe\u0301en Euclid a de\u0301couvert sept nouvelles plane\u0300tes orphelines, des mondes solitaires errant da ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Euclid d\u00e9couvre de nouvelles plan\u00e8tes sans \u00e9toile\" \/>\n<meta property=\"og:description\" content=\"Le te\u0301lescope spatial europe\u0301en Euclid a de\u0301couvert sept nouvelles plane\u0300tes orphelines, des mondes solitaires errant da ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile\" \/>\n<meta property=\"og:site_name\" content=\"Burkina Faso\" \/>\n<meta property=\"article:published_time\" content=\"2024-05-29T15:58:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-29T17:01:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/05\/sm_1716989379.316454.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"902\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Euclid d\u00e9couvre de nouvelles plan\u00e8tes sans \u00e9toile\",\"datePublished\":\"2024-05-29T15:58:48+00:00\",\"dateModified\":\"2024-05-29T17:01:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile\"},\"wordCount\":805,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/05\/sm_1716989379.316454.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Burkina Faso\",\"Burkina Faso\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile\",\"url\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/euclid-decouvre-de-nouvelles-planetes-sans-etoile\",\"name\":\"Euclid d\u00e9couvre de nouvelles plan\u00e8tes sans \u00e9toile - 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