{"id":18841,"date":"2019-04-03T10:56:21","date_gmt":"2019-04-03T08:56:21","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=18841"},"modified":"2019-04-03T10:56:21","modified_gmt":"2019-04-03T08:56:21","slug":"les-astronomes-confirment-enfin-la-presence-de-methane-sur-mars","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/les-astronomes-confirment-enfin-la-presence-de-methane-sur-mars\/","title":{"rendered":"Les astronomes confirment enfin la pr\u00e9sence de m\u00e9thane sur Mars"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Les chercheurs ont confirm\u00e9 pour la premi\u00e8re fois la d\u00e9tection de m\u00e9thane sur Mars. Depuis quinze ans, divers groupes de recherche pr\u00e9tendaient observer des traces de m\u00e9thane dans l&rsquo;atmosph\u00e8re de Mars. Curieusement, elles apparaissent souvent comme des nuages de gaz qui apparaissent et disparaissent sur de courtes \u00e9chelles de temps. Des groupes ont vivement d\u00e9battu pour savoir si le m\u00e9thane pouvait constituer un indice de vie ou simplement un processus g\u00e9ologique. D&rsquo;autres chercheurs se demandaient si le m\u00e9thane existait r\u00e9ellement ou si ces d\u00e9tections \u00e9taient simplement des erreurs.<\/p>\n<p>\u00c0 pr\u00e9sent, un groupe utilisant des donn\u00e9es de la sonde Mars Express de l&rsquo;Agence spatiale europ\u00e9enne (European Space Agency) indique avoir identifi\u00e9 du m\u00e9thane au-dessus du crat\u00e8re Gale le 16 juin 2013, juste un jour apr\u00e8s que le robot Curiosity de la NASA ait d\u00e9tect\u00e9 un pic de m\u00e9thane au niveau du sol dans le crat\u00e8re Gale. Il s&rsquo;agit de la premi\u00e8re d\u00e9couverte confirm\u00e9e d&rsquo;une importante substance dans la chasse \u00e0 la vie sur la plan\u00e8te rouge.<\/p>\n<p>Difficile \u00e0 rep\u00e9rer<\/p>\n<p>Des chercheurs, dirig\u00e9s par Marco Giuranna de l&rsquo;Istituto Nazionale di Astrofisica de Rome, ont utilis\u00e9 un instrument appel\u00e9 spectrom\u00e8tre plan\u00e9taire de Fourier (PFS) pour examiner la zone situ\u00e9e au-dessus du crat\u00e8re de Gale \u00e0 la mi-juin 2013. Dans les jours pr\u00e9c\u00e9dant l&rsquo;observation de Curiosity, Mars Express ne voyait pas de m\u00e9thane. Mars Express a observ\u00e9 une augmentation similaire du m\u00e9thane, dans la m\u00eame r\u00e9gion de la plan\u00e8te rouge. En quelques jours, le signal avait disparu pour les 2 sondes Curiosity et Mars Express.<\/p>\n<p>Des d\u00e9tections de m\u00e9thane ont \u00e9t\u00e9 d\u00e9tect\u00e9es pendant des ann\u00e9es sur la plan\u00e8te rouge. Soit les signaux \u00e9taient suffisamment faibles pour \u00eatre peu fiables, soit des chercheurs sceptiques pouvaient indiquer des sources de contamination possibles dans les donn\u00e9es. L&rsquo;apparition et la disparition soudaines ont \u00e9videmment compliqu\u00e9 la t\u00e2che de confirmer les r\u00e9sultats, mais elles ont \u00e9galement conduit les astronomes dans des orientations int\u00e9ressantes sur ce qui pouvait d\u00e9clencher la prolif\u00e9ration et la mort du m\u00e9thane.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18843\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/les-astronomes-confirment-enfin-la-presence-de-methane-sur-mars\/cratere-gale-zone-atterrissage-nasa-esa-mars-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?fit=1890%2C1062&amp;ssl=1\" data-orig-size=\"1890,1062\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"cratere-gale-zone-atterrissage-nasa-esa-mars\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?fit=800%2C450&amp;ssl=1\" class=\"alignnone size-full wp-image-18843\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?resize=1890%2C1062&#038;ssl=1\" alt=\"\" width=\"1890\" height=\"1062\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?w=1890&amp;ssl=1 1890w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?resize=800%2C450&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?resize=580%2C326&amp;ssl=1 580w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars-1.jpg?resize=174%2C98&amp;ssl=1 174w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Des processus biologiques pourraient-ils \u00eatre \u00e0 l&rsquo;\u0153uvre ? Sur Terre, la grande majorit\u00e9 du m\u00e9thane est produite par des \u00eatres vivants, des microbes aux humains. Un \u00e9cosyst\u00e8me souterrain martien qui expulse des poches de m\u00e9thane est extr\u00eamement s\u00e9duisant. Mais les processus g\u00e9ologiques peuvent \u00e9galement produire du m\u00e9thane du simple fait de la combinaison du soleil et de la chaleur sur certains types de roches. Ce qui est toujours int\u00e9ressant pour les g\u00e9ologues, mais c&rsquo;est beaucoup moins excitant que de d\u00e9couvrir la vie extraterrestre.<\/p>\n<p>La nouvelle recherche, publi\u00e9e le 1er avril 2019 dans Nature Geoscience, ne sp\u00e9cule pas sur ce qui pouvait causer le m\u00e9thane. Mais ils ciblent sur la carte le m\u00e9thane d&rsquo;o\u00f9 il aurait pu provenir. Le m\u00e9thane appara\u00eet et dispara\u00eet rapidement. Par cons\u00e9quent, il doit avoir son origine pr\u00e8s de l&rsquo;endroit o\u00f9 Curiosity a renifl\u00e9 le gaz. Les chercheurs ont examin\u00e9 une carte des environs de Curiosity et rep\u00e9r\u00e9 des zones similaires aux sources de m\u00e9thane courantes sur Terre : une faille, une source ou un \u00e9vent pouvant donner acc\u00e8s au monde souterrain de Mars. Ils identifient une zone appel\u00e9e Aeolis Mensae et ses environs comme la source la plus probable du m\u00e9thane.<\/p>\n<p>Bien que ce myst\u00e8re du m\u00e9thane de Mars ne soit pas encore r\u00e9solu, les chercheurs disposent d\u00e9sormais d&rsquo;une carte et de la preuve qu&rsquo;au moins leur chasse est une chasse \u00e0 courre dont l&rsquo;issue est de trouver le gibier.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"18844\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/les-astronomes-confirment-enfin-la-presence-de-methane-sur-mars\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?fit=1111%2C444&amp;ssl=1\" data-orig-size=\"1111,444\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?fit=800%2C320&amp;ssl=1\" class=\"alignnone size-full wp-image-18844\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?resize=1111%2C444&#038;ssl=1\" alt=\"\" width=\"1111\" height=\"444\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?w=1111&amp;ssl=1 1111w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?resize=300%2C120&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?resize=768%2C307&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/curiosity-robot-mars-francesoir_field_image_de_base_field_mise_en_avant_principale.jpg?resize=800%2C320&amp;ssl=1 800w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\">La Terre du Futur<\/a><\/p>\n<p>source : <a href=\"http:\/\/blogs.discovermagazine.com\/d-brief\/2019\/04\/01\/researchers-confirm-methane-on-mars\/\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/blogs.discovermagazine.com<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"18841\">(357)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Les chercheurs ont confirm\u00e9 pour la premi\u00e8re fois la d\u00e9tection de m\u00e9thane sur Mars. Depuis quinze ans, divers groupes de&#8230;<\/p>\n","protected":false},"author":1,"featured_media":18842,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Les astronomes confirment enfin la pr\u00e9sence de m\u00e9thane sur Mars @laterredufutur.com","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[22],"tags":[884,7122,333,123,2579,2381,308],"class_list":["post-18841","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-cratere","tag-cratere-gale","tag-eau","tag-mars","tag-methane","tag-planete-rouge","tag-vie","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/04\/cratere-gale-zone-atterrissage-nasa-esa-mars.jpg?fit=1024%2C640&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4TT","jetpack-related-posts":[{"id":16699,"url":"https:\/\/www.laterredufutur.com\/accueil\/des-molecules-organiques-decouvertes-sur-la-planete-mars-annonce-la-nasa\/","url_meta":{"origin":18841,"position":0},"title":"Des mol\u00e9cules organiques d\u00e9couvertes sur la plan\u00e8te Mars, annonce la Nasa","author":"Admin","date":"8 juin 2018","format":false,"excerpt":"La Nasa avait soign\u00e9 ses effets\u2009: excitation et myst\u00e8re entouraient la tenue de la conf\u00e9rence de presse de ce jeudi 7 juin, consacr\u00e9e \u00e0 la plan\u00e8te Mars. Depuis le centre spatial Goddard, dans le Maryland, l\u2019agence spatiale am\u00e9ricaine a annonc\u00e9 avoir d\u00e9couvert des mol\u00e9cules organiques vieilles de plusieurs milliards d\u2019ann\u00e9es.\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"Mars","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/11\/mars2.jpg?fit=450%2C283&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":4735,"url":"https:\/\/www.laterredufutur.com\/accueil\/de-la-vie-sur-mars\/","url_meta":{"origin":18841,"position":1},"title":"De la vie sur Mars ?","author":"Admin","date":"17 janvier 2009","format":false,"excerpt":"Des aliens microscopiques vivant sous le sol martien seraient responsables de l'\u00e9mission d'un nuage de m\u00e9thane autour de la plan\u00e8te rouge, d'apr\u00e8s les scientifiques de la Nasa. Les \u00e9missions saisonni\u00e8res de m\u00e9thane ont \u00e9t\u00e9 d\u00e9tect\u00e9es sur Mars, signe d'activit\u00e9 g\u00e9ologique ou biologique dans le sous-sol, selon des chercheurs am\u00e9ricains qui\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/mars_methane.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":7305,"url":"https:\/\/www.laterredufutur.com\/accueil\/des-organismes-terriens-pourraient-survivre-sur-mars\/","url_meta":{"origin":18841,"position":2},"title":"Des organismes terriens pourraient survivre sur Mars","author":"Admin","date":"11 juin 2015","format":false,"excerpt":"C'est officiel, des organismes terriens pourraient survivre sur la plan\u00e8te inhospitali\u00e8re, Mars. L'environnement hostile et les derni\u00e8res informations \u00e0 propos du rover Curiosity, qui serait \u00e0 l'origine du m\u00e9thane d\u00e9tect\u00e9, rendaient difficile l'acceptation d'une possible forme de vie sur Mars. N\u00e9anmoins, une nouvelle \u00e9tude montre que certains organismes terriens pourraient\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/mars-microbes.jpeg?fit=550%2C412&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/mars-microbes.jpeg?fit=550%2C412&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/06\/mars-microbes.jpeg?fit=550%2C412&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":11431,"url":"https:\/\/www.laterredufutur.com\/accueil\/exomars-la-mission-pour-la-recherche-de-la-vie\/","url_meta":{"origin":18841,"position":3},"title":"Exomars, la mission pour la recherche de la vie","author":"Admin","date":"14 mars 2016","format":false,"excerpt":"Les Am\u00e9ricains ne seront bient\u00f4t plus seuls sur Mars. Le 19 octobre prochain, une partie du mat\u00e9riel de la mission russo-europ\u00e9enne ExoMars 2016, embarqu\u00e9 \u00e0 bord de la fus\u00e9e Proton qui a d\u00e9coll\u00e9 ce lundi, \u00e0 10h31 (heure de Paris), depuis le cosmodrome de Ba\u00efkonour, devrait atterrir \u00e0 la surface\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/03\/exomars-program.jpg?fit=400%2C311&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3312,"url":"https:\/\/www.laterredufutur.com\/accueil\/pollution-observee-par-satellite\/","url_meta":{"origin":18841,"position":4},"title":"Pollution Observ\u00e9e par Satellite","author":"Admin","date":"6 f\u00e9vrier 2006","format":false,"excerpt":"Le 1er mars 2002, une fus\u00e9e\u00a0Ariane 5 d\u00e9collait du centre spatial de\u00a0Kourou en Guin\u00e9e fran\u00e7aise (c\u00f4te nord de l'Am\u00e9rique du Sud). Elle\u00a0emportait un satellite de 8 tonnes: ENVISAT. Un petit instrument \u00e0 l'int\u00e9rieur de ce colosse: SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) Les traces de l'activit\u00e9 industrielle de\u2026","rel":"","context":"Dans &quot;Pollution&quot;","block_context":{"text":"Pollution","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/pollution\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/pollution-monde.jpeg?fit=400%2C218&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":27379,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dun-interrupteur-de-methane-dans-locean-arctique-qui-a-contribue-au-rechauffement-climatique-rapide\/","url_meta":{"origin":18841,"position":5},"title":"D\u00e9couverte d&rsquo;un \u00ab interrupteur \u00bb de m\u00e9thane dans l&rsquo;oc\u00e9an Arctique qui a contribu\u00e9 au r\u00e9chauffement climatique rapide","author":"Admin","date":"23 octobre 2025","format":false,"excerpt":"L\u2019oc\u00e9an Arctique \u00e9tait autrefois une source importante de gaz \u00e0 effet de serre dans l\u2019atmosph\u00e8re \u2014 et il pourrait le redevenir, avertissent les chercheurs. L\u2019oc\u00e9an Arctique \u00e9tait autrefois une source importante de gaz \u00e0 effet de serre dans l\u2019atmosph\u00e8re \u2014 et il pourrait le redevenir, avertissent les chercheurs. 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