{"id":5406,"date":"2010-06-18T19:45:55","date_gmt":"2010-06-18T17:45:55","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=5406"},"modified":"2015-04-14T19:47:16","modified_gmt":"2015-04-14T17:47:16","slug":"vie-extraterrestre-titan-un-bon-candidat","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/vie-extraterrestre-titan-un-bon-candidat\/","title":{"rendered":"Vie extraterrestre : Titan, un bon candidat ?"},"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 align=\"justify\"><span style=\"font-size: small;\">Espace &#8211; Les mesures relev\u00e9es par la sonde spatiale Cassini am\u00e8nent certains chercheurs \u00e0 \u00e9voquer la possibilit\u00e9 d&rsquo;une vie sur Titan, la plus grande des lunes de Saturne.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Les analyses effectu\u00e9es lors de la mission euro-am\u00e9ricaine Cassini-Huygens, d\u00e9but\u00e9e en 2004, indiquent une intense activit\u00e9 chimique organique \u00e0 la surface de Titan : pluies d&rsquo;\u00e9thane, lacs d&rsquo;hydrocarbures, glace&#8230; Des conditions potentiellement compatibles avec l&rsquo;apparition d&rsquo;une vie primitive, bas\u00e9e sur la chimie du m\u00e9thane, et non de l&rsquo;eau comme c&rsquo;est le cas sur Terre.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">La disparition de l&rsquo;hydrog\u00e8ne atmosph\u00e9rique constat\u00e9e \u00e0 la surface de l&rsquo;astre pourrait \u00eatre envisag\u00e9e comme le signe d&rsquo;une \u00ab\u00a0respiration\u00a0\u00bb, le gaz pouvant ainsi \u00eatre absorb\u00e9 par des micro-organismes.<\/span><\/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 align=\"justify\"><span style=\"font-size: small;\">D&rsquo;autre part, l&rsquo;action des rayons solaires sur son atmosph\u00e8re dense devrait produire de l&rsquo;ac\u00e9tyl\u00e8ne. Or, il n&rsquo;y en a pas. Cette absence, l\u00e0 encore, pourrait \u00eatre interpr\u00e9t\u00e9e comme la signature d&rsquo;une vie primitive, d\u00e9gradant l&rsquo;ac\u00e9tyl\u00e8ne pour se d\u00e9velopper.Telles sont les id\u00e9es avanc\u00e9es par Chris McKay, astrobiologiste \u00e0 la Nasa.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Mark Allen, travaillant lui-aussi pour l&rsquo;agence spatiale am\u00e9ricaine, pr\u00e9cise cependant que ce ph\u00e9nom\u00e8ne peut avoir des raisons non biologiques, comme la transformation de l&rsquo;ac\u00e9tyl\u00e8ne en mol\u00e9cules plus complexes par les rayons solaires ou cosmiques. Enfin, l&rsquo;\u00e9crivain et journaliste britannique Michael Hanlon rappelle quant \u00e0 lui que les multiples r\u00e9actions chimiques propres \u00e0 la vie sont tr\u00e8s gourmandes en \u00e9nergie, donc en chaleur, et que la temp\u00e9rature \u00e0 la surface de Titan est de -170\u00b0C.<\/span><\/p>\n<p align=\"justify\">source : <a href=\"http:\/\/fr.news.yahoo.com\/\">http:\/\/fr.news.yahoo.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"5406\">(248)<\/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>Espace &#8211; Les mesures relev\u00e9es par la sonde spatiale Cassini am\u00e8nent certains chercheurs \u00e0 \u00e9voquer la possibilit\u00e9 d&rsquo;une vie sur&#8230;<\/p>\n","protected":false},"author":1,"featured_media":5407,"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":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[22],"tags":[3906,122,1628,3644,308],"class_list":["post-5406","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-extraterrestre","tag-lune","tag-saturne","tag-titan","tag-vie","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/titan1.jpg?fit=573%2C580&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-1pc","jetpack-related-posts":[{"id":13801,"url":"https:\/\/www.laterredufutur.com\/accueil\/notre-systeme-solaire-contient-des-oceans-partout\/","url_meta":{"origin":5406,"position":0},"title":"Notre syst\u00e8me solaire contient des oc\u00e9ans partout","author":"Admin","date":"7 novembre 2016","format":false,"excerpt":"De tout temps, l\u2019Homme a toujours cru que la Terre et ses oc\u00e9ans en faisaient un lieu tout \u00e0 fait exceptionnel, il avait raison. Par la vie \u00a0qui s\u2019est d\u00e9velopp\u00e9e sur notre plan\u00e8te, notre berceau est fantastique. Cependant toute cette eau qui a baign\u00e9 les \u00e9l\u00e9ments de cette vie est\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\/10\/ocean.jpg?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/ocean.jpg?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/ocean.jpg?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/ocean.jpg?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/ocean.jpg?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":4917,"url":"https:\/\/www.laterredufutur.com\/accueil\/titan-de-gigantesques-reserves-dhydrocarbure\/","url_meta":{"origin":5406,"position":1},"title":"Titan: de gigantesques r\u00e9serves d&rsquo;hydrocarbure","author":"Admin","date":"12 juin 2009","format":false,"excerpt":"La lune (On appelle lune tout satellite naturel d'une plan\u00e8te, mais la Lune, avec un L majuscule, d\u00e9signe le seul satellite...) orange de Saturne, Titan (Cliquez sur l'image pour une description), a des centaines de fois plus d'hydrocarbures liquides que l'ensemble (En th\u00e9orie des ensembles, un ensemble, d\u00e9signe intuitivement une\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\/04\/titan.jpg?fit=389%2C292&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":17620,"url":"https:\/\/www.laterredufutur.com\/accueil\/titan-le-seul-astre-connu-au-dela-de-la-terre-qui-possede-des-lacs-liquides-sur-sa-surface\/","url_meta":{"origin":5406,"position":2},"title":"Titan, le seul astre connu au-del\u00e0 de la Terre qui poss\u00e8de des lacs liquides sur sa surface","author":"Admin","date":"7 f\u00e9vrier 2019","format":false,"excerpt":"La lune de Saturne, Titan, est le seul endroit au-del\u00e0 de la Terre avec des lacs liquides \u00e0 sa surface. Une nouvelle \u00e9tude refl\u00e8te une vision surprenante et diff\u00e9rente de ces lacs et mers de notre monde, avec de petites vagues qui les ondulent. Publi\u00e9s dans la revue Earth and\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\/2019\/01\/titan_lacs.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/titan_lacs.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/titan_lacs.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/titan_lacs.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":4366,"url":"https:\/\/www.laterredufutur.com\/accueil\/encelade-une-lune-de-saturne-pourrait-abriter-de-leau-et-peut-etre-la-vie\/","url_meta":{"origin":5406,"position":3},"title":"Encelade, une lune de Saturne pourrait abriter de l&rsquo;eau et peut-\u00eatre la vie","author":"Admin","date":"28 mars 2008","format":false,"excerpt":"WASHINGTON (AFP) - La sonde am\u00e9ricaine Cassini a d\u00e9tect\u00e9 des temp\u00e9ratures et des mol\u00e9cules organiques complexes attestant de la pr\u00e9sence d'eau et de conditions de vie possibles sur Encelade, une des lunes de Saturne, selon la Nasa. Le 12 mars, Cassini a d\u00e9cel\u00e9 une forte densit\u00e9 de vapeur d'eau et\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\/04\/Encelade.jpg?fit=260%2C261&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":15127,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-images-fantastiques-de-la-sonde-la-sonde-cassini\/","url_meta":{"origin":5406,"position":4},"title":"Les images fantastiques de la sonde Cassini","author":"Admin","date":"2 mai 2017","format":false,"excerpt":"En orbite autour de Saturne depuis 2004, la sonde am\u00e9ricaine Cassini s\u2019est aventur\u00e9e entre la surface de la plan\u00e8te gazeuse et l\u2019int\u00e9rieur de ses anneaux, une zone \u00e0 risque jusqu\u2019\u00e0 pr\u00e9sent inexplor\u00e9e. Elle a repris contact avec la NASA jeudi 27 avril 2017 pour livrer des images in\u00e9dites. LA PREMI\u00c8RE\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\/2017\/05\/cassini-saturne.jpg?fit=805%2C453&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/cassini-saturne.jpg?fit=805%2C453&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/cassini-saturne.jpg?fit=805%2C453&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/cassini-saturne.jpg?fit=805%2C453&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":13537,"url":"https:\/\/www.laterredufutur.com\/accueil\/dione-dissimulerait-un-ocean-deau-liquide\/","url_meta":{"origin":5406,"position":5},"title":"Dion\u00e9 dissimulerait un oc\u00e9an d&rsquo;eau liquide","author":"Admin","date":"12 octobre 2016","format":false,"excerpt":"Saturne compte plusieurs lunes diff\u00e9rentes. Dion\u00e9 est l\u2019une d\u2019entre elles et elle fait couler beaucoup d\u2019encre depuis la fin de semaine derni\u00e8re. Cela n\u2019a d\u2019ailleurs rien de surprenant, car des astronomes belges pensent avoir d\u00e9couvert la preuve de l\u2019existence d\u2019un oc\u00e9an d\u2019eau liquide sous la surface du satellite. Dion\u00e9 a\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\/10\/dione.jpg?fit=640%2C507&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/10\/dione.jpg?fit=640%2C507&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/10\/dione.jpg?fit=640%2C507&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/5406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=5406"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/5406\/revisions"}],"predecessor-version":[{"id":5408,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/5406\/revisions\/5408"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/5407"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=5406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=5406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=5406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}