{"id":7255,"date":"2022-05-28T18:50:09","date_gmt":"2022-05-28T18:50:09","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie"},"modified":"2022-05-29T16:54:00","modified_gmt":"2022-05-29T16:54:00","slug":"il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie","title":{"rendered":"Il y aurait beaucoup de Tatooine habitables dans la Galaxie"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>EN VID\u00c9O] De nombreuses plan\u00e8tes habitables autour d\u2019\u00e9toiles doubles Des chercheurs de l\u2019universit\u00e9 de Copenhague (Danemark) ont simul\u00e9, \u00e0 partir de donn\u00e9es recueillies par le Grand r\u00e9seau d\u2019antennes millim\u00e9trique\/submillim\u00e9trique de l\u2019Atacama (Alma, Chili), la dynamique d\u2019une \u00e9toile double situ\u00e9e \u00e0 environ 1.000 ann\u00e9es-lumi\u00e8re de notre Terre. Le syst\u00e8me baptis\u00e9 NGC 1333-IRAS2A. Les images montrent notamment que le mouvement des gaz et des poussi\u00e8res autour des \u00e9toiles qui forment le syst\u00e8me n\u2019est pas lin\u00e9aire. Il devient tr\u00e8s fort pendant de courtes p\u00e9riodes de dix \u00e0 cent ann\u00e9es. Et ce, tous les mille ans environ. De quoi faire briller l\u2019\u00e9toile de dix \u00e0 cent fois plus. Un processus qui pourrait \u00e9tendre la zone habitable de telles \u00e9toiles. \u00a9 J\u00f8rgensen, Kuruwita et al., Universit\u00e9 de Copenhague<\/p>\n<p>La moiti\u00e9 des \u00e9toiles qui ressemblent \u00e0 notre Soleil sont de celles que les astronomes appellent des \u00e9toiles doubles. En r\u00e9alit\u00e9, des syst\u00e8mes form\u00e9s de deux \u00e9toiles en orbite l\u2019une autour de l\u2019autre. Une configuration qui n\u2019est pas sans cons\u00e9quence sur la composition des plan\u00e8tes qui les entourent. Y compris des plan\u00e8tes qui pourraient h\u00e9berger une forme de vie extraterrestre.<\/p>\n<p>Il y a tellement d\u2019\u00e9toiles dans notre Univers. Tellement de plan\u00e8tes aussi. Y chercher les traces d\u2019une vie extraterrestre, c\u2019est un peu comme chercher une aiguille dans une botte de foin. Sauf, peut-\u00eatre, \u00e0 se concentrer en priorit\u00e9 sur des plan\u00e8tes semblables \u00e0 la seule plan\u00e8te que nous connaissons \u00e0 avoir permis \u00e0 la vie de se d\u00e9velopper : notre Terre. C\u2019est pourquoi les astronomes fouillent le ciel \u00e0 la recherche d\u2019\u00e9toiles proches du Soleil. Du moins de ses caract\u00e9ristiques. Or, la moiti\u00e9 d\u2019entre elles sont des \u00e9toiles doubles. Cela a-t-il un impact sur les chances d\u2019y voir se d\u00e9velopper la vie ?<\/p>\n<p>Possible, nous disent aujourd\u2019hui des chercheurs de l\u2019universit\u00e9 de Copenhague (Danemark). Ils viennent de montrer que les syst\u00e8mes plan\u00e9taires se forment de mani\u00e8re tr\u00e8s diff\u00e9rente autour des \u00e9toiles doubles. Un processus qui pourrait augmenter les chances d\u2019y voir se d\u00e9velopper des plan\u00e8tes habitables.<\/p>\n<p>Comme point de d\u00e9part de ces travaux, il y a des observations r\u00e9alis\u00e9es gr\u00e2ce au Grand r\u00e9seau d\u2019antennes millim\u00e9trique\/submillim\u00e9trique de l\u2019Atacama (Alma, Chili). Elles montrent l\u2019instantan\u00e9 d\u2019une jeune \u00e9toile double \u2013 elle n\u2019est \u00e2g\u00e9e que de quelque 10.000 ans \u2013 entour\u00e9e d\u2019un disque de gaz et de poussi\u00e8re. Le syst\u00e8me NGC 1333-IRAS2A est situ\u00e9 \u00e0 environ 1.000 ann\u00e9es-lumi\u00e8re de notre Terre. Il est compos\u00e9 de deux \u00e9toiles s\u00e9par\u00e9es l\u2019une de l\u2019autre d\u2019environ 200 unit\u00e9s astronomiques. Comprenez, d\u2019environ 200 fois la distance Terre-Soleil ou plus de six fois la distance Soleil-Neptune.<\/p>\n<p>Le rendu de l\u2019une des simulations informatiques mises en \u0153uvre par les chercheurs de l\u2019universit\u00e9 de Copenhague (Danemark) pour \u00e9tudier la dynamique d\u2019une \u00e9toile double. \u00a9 J\u00f8rgensen, Kuruwita et al., Universit\u00e9 de Copenhague<\/p>\n<p>Une zone habitable plus \u00e9tendue<\/p>\n<p>\u00c0 partir de ces observations, les astronomes ont lanc\u00e9 des simulations informatiques qui montrent que l\u2019\u00e9volution du disque de gaz et de poussi\u00e8re \u2013 celui-l\u00e0 m\u00eame qui est destin\u00e9 \u00e0 donner naissance \u00e0 des exoplan\u00e8tes \u2013 n\u2019est pas lin\u00e9aire. Tous les 1.000 ans environ et pendant dix \u00e0 cent ans, il est secou\u00e9 de mouvements forts. En parall\u00e8le, l\u2019\u00e9toile double devient tr\u00e8s brillante. Dix \u00e0 cent fois plus qu\u2019en temps normal. Probablement un effet de la gravit\u00e9 qu\u2019exercent, l\u2019une sur l\u2019autre, les deux \u00e9toiles qui composent le syst\u00e8me. Et qui, \u00e0 certains moments, fait tomber d\u2019\u00e9normes quantit\u00e9s de mati\u00e8re vers son \u00e9toile principale, entra\u00eenant un \u00e9chauffement et donc, un accroissement de la luminosit\u00e9 de l\u2019\u00e9toile en question.<\/p>\n<p>Ces sursauts, disent les chercheurs, pourraient avoir une influence sur la structure du syst\u00e8me plan\u00e9taire en formation. Une influence sur la composition chimique du mat\u00e9riau \u00e0 partir duquel les plan\u00e8tes vont se former. Car ces phases d\u2019\u00e9chauffement vont d\u00e9clencher l\u2019\u00e9vaporation des grains de poussi\u00e8re et de la glace qui peut les entourer. Une influence, donc, sur l\u2019\u00e9tendue de celle que les chercheurs d\u2019extraterrestres connaissent sous le nom de zone habitable. Une r\u00e9gion dans laquelle de l\u2019eau \u00e0 l\u2019\u00e9tat liquide peut exister, notamment.<\/p>\n<p>Pour mieux comprendre si le processus peut laisser une chance aux ingr\u00e9dients de la vie de se rencontrer dans de tels syst\u00e8mes d\u2019\u00e9toiles doubles, les astronomes auront besoin de plus de donn\u00e9es d\u2019observations. Ils auront aussi besoin de savoir si des com\u00e8tes \u00e0 forte teneur en glace pourraient apporter, sur les plan\u00e8tes pr\u00eates \u00e0 cela, les briques de base de la vie. Pour y r\u00e9pondre, les chercheurs attendent encore beaucoup d\u2019Alma, mais aussi des nouveaux instruments qui seront bient\u00f4t \u00e0 leur disposition : le t\u00e9lescope spatial James-Webb (JWST), l\u2019European Large Telescope (ELT) ou encore le Square Kilometre Array (SKA). Les astronomes disposeront alors d\u2019une combinaison de sources d\u2019information qui devrait donner des r\u00e9sultats int\u00e9ressants.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/madagascar\">Madagascar<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Madagascar. EN VID\u00c9O] De nombreuses plan\u00e8tes habitables autour d\u2019\u00e9toiles doubles Des chercheurs de l\u2019universit\u00e9 de Copenhague (Danemark) ont simul\u00e9, \u00e0 partir de donn\u00e9es recueillies par le Grand r\u00e9seau d\u2019antennes millim\u00e9trique\/submillim\u00e9trique de l\u2019Atacama (Alma, Chili), la dynamique d\u2019une \u00e9toile double situ\u00e9e \u00e0 environ 1.000 ann\u00e9es-lumi\u00e8re de notre Terre. Le syst\u00e8me baptis\u00e9 NGC 1333-IRAS2A. Les [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":7254,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,10],"tags":[36,50,49],"class_list":["post-7255","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"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>Il y aurait beaucoup de Tatooine habitables dans la Galaxie - Madagascar<\/title>\n<meta name=\"description\" content=\"EN VID\u00c9O] De nombreuses plan\u00e8tes habitables autour d\u2019\u00e9toiles doubles Des chercheurs de l\u2019universit\u00e9 de Copenhague (Danem ...\" \/>\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\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Il y aurait beaucoup de Tatooine habitables dans la Galaxie\" \/>\n<meta property=\"og:description\" content=\"EN VID\u00c9O] De nombreuses plan\u00e8tes habitables autour d\u2019\u00e9toiles doubles Des chercheurs de l\u2019universit\u00e9 de Copenhague (Danem ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie\" \/>\n<meta property=\"og:site_name\" content=\"Madagascar\" \/>\n<meta property=\"article:published_time\" content=\"2022-05-28T18:50:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-05-29T16:54:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2022\/05\/postQueueImg_2-6292700e3ef6c.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"689\" \/>\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\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Il y aurait beaucoup de Tatooine habitables dans la Galaxie\",\"datePublished\":\"2022-05-28T18:50:09+00:00\",\"dateModified\":\"2022-05-29T16:54:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie\"},\"wordCount\":899,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2022\/05\/postQueueImg_2-6292700e3ef6c.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Madagascar\",\"Madagascar\"],\"articleSection\":[\"homepage-french\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie\",\"url\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/il-y-aurait-beaucoup-de-tatooine-habitables-dans-la-galaxie\",\"name\":\"Il y aurait beaucoup de Tatooine habitables dans la Galaxie - 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