{"id":21225,"date":"2023-11-04T21:08:01","date_gmt":"2023-11-04T21:08:01","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/la-vie-plus-facile-a-reperer-sur-la-terre-du-temps-des-dinosaures"},"modified":"2023-11-04T22:19:18","modified_gmt":"2023-11-04T22:19:18","slug":"la-vie-plus-facile-a-reperer-sur-la-terre-du-temps-des-dinosaures","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/la-vie-plus-facile-a-reperer-sur-la-terre-du-temps-des-dinosaures","title":{"rendered":"La vie plus facile \u00e0 rep\u00e9rer sur la Terre du Temps des dinosaures"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>Un dinosaure sera-t-il la premie\u0300re cre\u0301ature extraterrestre identifie\u0301e sur une exoplane\u0300te ? Sans doute pas&#8230; Mais la pe\u0301riode durant laquelle ils ont ve\u0301cu sur Terre correspond a\u0300 celle ou\u0300 les indices de la pre\u0301sence d\u2019une activite\u0301 biologique, donc de traces de vie, seraient les plus faciles a\u0300 de\u0301tecter, si d\u2019hypothe\u0301tiques et lointains astronomes avaient e\u0301tudie\u0301 notre plane\u0300te.<\/p>\n<p><b>Le spectre lumineux de la Terre a\u0300 diffe\u0301rents moments cle\u0301<\/b><\/p>\n<p>Ce sont des chercheurs de l\u2019Universite\u0301 de Cornell qui ont re\u0301alise\u0301 cette e\u0301tude base\u0301e sur l\u2019analyse de deux paires de biosignatures. : oxyge\u0300ne et me\u0301thane et ozone et me\u0301thane. Les deux de\u0301pendent fortement du niveau d\u2019oxyge\u0300ne et de carbone atmosphe\u0301rique qui a e\u0301norme\u0301ment varie\u0301 au cours du Phane\u0301rozoi\u0308que, un e\u0301on qui couvre les derniers 541 millions d\u2019anne\u0301es (Ma) de l\u2019histoire terrestre.<\/p>\n<p>Pour mieux appre\u0301hender ces variations, les scientifiques ont utilise\u0301 diffe\u0301rents mode\u0300les pour e\u0301valuer la quantite\u0301 d\u2019oxyge\u0300ne dans l\u2019atmosphe\u0300re a\u0300 cinq dates cle\u0301s.<\/p>\n<p>Les auteurs de l\u2019e\u0301tude, publie\u0301e dans la revue Monthly Notices of the Royal Astronomical Society Letters, se sont ainsi focalise\u0301s sur la Terre d\u2019il y a 500 Ma, avant l\u2019apparition des plantes terrestres.<\/p>\n<p>Puis d\u2019il y a 400 Ma, apre\u0300s l\u2019e\u0301volution des premie\u0300res plantes vasculaires, et a\u0300 300 Ma, quand la plane\u0300te e\u0301tait domine\u0301e par des fore\u0302ts mare\u0301cageuses. Et a\u0300 200 Ma au moment ou\u0300 un certain e\u0301quilibre entre photosynthe\u0300se et de\u0301gazage volcanique s\u2019e\u0301tablit et enfin a\u0300 100 Ma, durant la dislocation de la Pange\u0301e, le supercontinent qui re\u0301unissait toutes les terres e\u0301merge\u0301es.<\/p>\n<p>Les re\u0301sultats indiquent que la teneur en CO2 a re\u0301gulie\u0300rement de\u0301crue au cours de cette pe\u0301riode, passant de plus de 3000 ppm (partie par millions) il y a 500 Ma a\u0300 un peu plus de 400 ppm aujourd\u2019hui.<\/p>\n<p>L\u2019oxyge\u0300ne quant a\u0300 lui a suivi une courbe inverse passant de quelques pourcents il y a 500 Ma a\u0300 21% de nos jours. Ne\u0301anmoins, les auteurs identifient deux pics d\u2019O2 : il y a 300 Ma et il y a 100 Ma avec des niveaux autour de 30%. Dans cet intervalle, la concentration d\u2019oxyge\u0300ne atmosphe\u0301rique est reste\u0301e au-dessus du niveau actuel.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"306\" class=\"alignnone wp-image-21223 size-full\" src=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/11\/sm_1699120037.970348.jpg\" srcset=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/11\/sm_1699120037.970348.jpg 453w, https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2023\/11\/sm_1699120037.970348-300x203.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Fene\u0302tre sur les dinosaures<\/b><\/p>\n<p>Pour chacune de ces e\u0301tapes, les scientifiques ont calcule\u0301 l\u2019empreinte lumineuse de la Terre : \u201cIl ne s\u2019agit que des 12 % les plus re\u0301cents de l\u2019histoire de la Terre, mais cela englobe a\u0300 peu pre\u0300s toute la pe\u0301riode pendant laquelle la vie e\u0301tait plus complexe que les e\u0301ponges\u201d, souligne, dans un communique\u0301 Rebecca Payne, principale auteure de l\u2019e\u0301tude.<\/p>\n<p>Il en re\u0301sulte que les paires de biosignatures 02-CH4 et 03-CH4 e\u0301taient plus visibles entre il y a 100 et 300 Ma, une pe\u0301riode qui couvre presque entie\u0300rement l\u2019e\u0300re des dinosaures (-230 a\u0300 -66 Ma). \u201cL\u2019empreinte lumineuse de la Terre moderne a e\u0301te\u0301 notre mode\u0300le pour identifier les plane\u0300tes potentiellement habitables, mais il fut un temps ou\u0300 cette empreinte e\u0301tait encore plus prononce\u0301e \u2013 meilleure pour montrer des signes de vie\u201d, souligne, dans le me\u0302me communique\u0301, Lisa Kaltenegger, directrice de l\u2019Institut Carl Sagan.<\/p>\n<p>Bien que les astrobiologistes ne s\u2019attendent pas a\u0300 trouver l\u2019e\u0301quivalent d\u2019un T. rex sur une exoplane\u0300te, cette e\u0301tude permet de mieux savoir quelles signatures rechercher dans leurs atmosphe\u0300res. Les mode\u0300les de spectres propose\u0301s ici identifient des plane\u0300tes comme la Terre phane\u0301rozoi\u0308que comme les cibles les plus prometteuses pour trouver de la vie dans le cosmos.<\/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. Un dinosaure sera-t-il la premie\u0300re cre\u0301ature extraterrestre identifie\u0301e sur une exoplane\u0300te ? Sans doute pas&#8230; Mais la pe\u0301riode durant laquelle ils ont ve\u0301cu sur Terre correspond a\u0300 celle ou\u0300 les indices de la pre\u0301sence d\u2019une activite\u0301 biologique, donc de traces de vie, seraient les plus faciles a\u0300 de\u0301tecter, si d\u2019hypothe\u0301tiques et lointains [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":21224,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-21225","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","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>La vie plus facile \u00e0 rep\u00e9rer sur la Terre du Temps des dinosaures - Madagascar<\/title>\n<meta name=\"description\" content=\"Un dinosaure sera-t-il la premie\u0300re cre\u0301ature extraterrestre identifie\u0301e sur une exoplane\u0300te ? 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