{"id":4654,"date":"2008-10-27T17:21:32","date_gmt":"2008-10-27T15:21:32","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil1\/?p=4654"},"modified":"2015-04-13T17:22:53","modified_gmt":"2015-04-13T15:22:53","slug":"une-supernova-responsable-de-lextinction-des-mammouths","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-supernova-responsable-de-lextinction-des-mammouths\/","title":{"rendered":"Une supernova responsable de l&rsquo;extinction des mammouths ?"},"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;\">Les mammouths ont disparu de notre plan\u00e8te voil\u00e0 13 000 ans avec de nombreux autres animaux en Am\u00e9rique du Nord. Qu&rsquo;est ce qui a provoqu\u00e9 cette extinction ?<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">L\u2019explosion d\u2019une supernova en serait responsable selon Richard Firestone, un scientifique de l&rsquo;atome et le g\u00e9ologue Allen West.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Ev\u00e8nements en cha\u00eene<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Mammouth Imp\u00e9rial<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Le souffle de cette supernova, il y a 41 000 ans, aurait amorc\u00e9 une suite d&rsquo;\u00e9v\u00e8nements qui a abouti \u00e0 l&rsquo;extinction d\u2019une partie de la faune d\u2019Am\u00e9rique du Nord. Les mammouths, les mastodontes, les paresseux terrestres g\u00e9ants ou les f\u00e9lins \u00e0 dents de sabre ainsi que de nombreuses plantes auraient alors disparu.<br \/>\nLa th\u00e9orie du changement climatique est celle qui, officiellement, explique ces disparitions brutales qui se sont \u00e9chelonn\u00e9es durant le Pl\u00e9istoc\u00e8ne sup\u00e9rieur.<br \/>\nSelon les deux scientifiques, la preuve de leur th\u00e9orie consiste en une paire de d\u00e9fenses de mammouth de 34 000 ans, cribl\u00e9e de minuscules impacts. Suite \u00e0 l\u2019explosion de la supernova, des grains riches en fer se seraient abattus sur la Terre. Ce sont ces grains qui auraient cribl\u00e9 les d\u00e9fenses.<br \/>\nCes grains auraient voyag\u00e9 dans la galaxie \u00e0 la vitesse de 6.214 miles \u00e0 la seconde (10 000 km\/s), selon Firestone et West. Ils pensent que la supernova a <img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/mammouth.jpg?resize=239%2C289\" alt=\"\" width=\"239\" height=\"289\" align=\"left\" \/>explos\u00e9 \u00e0 250 ann\u00e9es-lumi\u00e8re de la Terre. Cette distance expliquerait le retard de 7 000 ans avant que les impacts provoquent des d\u00e9g\u00e2ts sur la faune et la flore.<br \/>\n21 000 ans apr\u00e8s cet \u00e9v\u00e8nement, les scientifiques pensent qu&rsquo;une formation ressemblant \u00e0 une com\u00e8te, issue des d\u00e9bris de la supernova, est pass\u00e9e au-dessus de l&rsquo;Am\u00e9rique du Nord, et a tout d\u00e9vast\u00e9.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Un \u00e9v\u00e8nement cosmique mortel<\/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;\">Explosion d&rsquo;une supernova<br \/>\nDes vents cycloniques br\u00fblants auraient d\u00e9ferl\u00e9 \u00e0 travers l&rsquo;Am\u00e9rique du Nord \u00e0 une vitesse de 400 km\/h.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Selon Firestone :<br \/>\n\u00abL&rsquo;\u00e9v\u00e8nement cosmique, comparable \u00e0 une com\u00e8te, a \u00e9t\u00e9 suivi d\u2019un d\u00e9luge de particules incandescentes.<br \/>\nSi cela n&rsquo;a pas tu\u00e9 tout de suite les grands animaux, les changements de climat qui ont suivi se sont charg\u00e9 de le faire.\u00bb<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Les preuves avanc\u00e9es<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Ces d\u00e9couvertes ont \u00e9t\u00e9 pr\u00e9sent\u00e9es \u00e0 la conf\u00e9rence internationale \u00abWorld of Elephants\u00bb, \u00e0 Hot Springs, dans le Dakota du Sud. Outre les d\u00e9fenses de mammouths cribl\u00e9es d\u2019impact, les deux chercheurs ont \u00e9mis d&rsquo;autres hypoth\u00e8ses qui demandent \u00e0 \u00eatre confirm\u00e9es. Les chercheurs pensent que les pointes de fl\u00e8ches de la civilisation pr\u00e9historique de Clovis, en Am\u00e9rique du Nord, qui s&rsquo;est \u00e9teinte il y a environ 13 500 ou 13 000 ans contiennent des quantit\u00e9s de radiations plus \u00e9lev\u00e9es que d&rsquo;habitude, sous la forme de pics du potassium-40. La m\u00eame anomalie serait contenue dans les s\u00e9diments marins islandais ainsi que <img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/mammouth1.jpg?resize=428%2C321\" alt=\"\" width=\"428\" height=\"321\" align=\"left\" \/>de neufs autres sites vieux de 13 000 ans en Am\u00e9rique du Nord. En effet, des particules magn\u00e9tiques ont \u00e9t\u00e9 d\u00e9couvertes sur ces sites. Leur analyse r\u00e9v\u00e8le qu&rsquo;elles sont riches en titane, en fer, en mangan\u00e8se, en vanadium, en \u00e9l\u00e9ments rares sur Terre, en thorium et uranium. Par contre, ces \u00e9l\u00e9ments sont communs dans les roches et les m\u00e9t\u00e9orites lunaires. Pour Firestone et West, c&rsquo;est une preuve suppl\u00e9mentaire que l&rsquo;Am\u00e9rique du Nord a bien \u00e9t\u00e9 bombard\u00e9e. Des recherches devraient \u00eatre men\u00e9es afin de pouvoir confirmer ou infirmer cette th\u00e9orie de la supernova.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">source : <\/span><a href=\"http:\/\/deamonspace.fr\/\"><span style=\"font-size: small;\">http:\/\/deamonspace.fr\/<\/span><\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"4654\">(754)<\/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 mammouths ont disparu de notre plan\u00e8te voil\u00e0 13 000 ans avec de nombreux autres animaux en Am\u00e9rique du Nord&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":4655,"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":[33,22],"tags":[1609,117,951,3521,3520],"class_list":["post-4654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","category-espace","tag-disparition","tag-espace","tag-mammouth","tag-responsable","tag-supernova","wpcat-33-id","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/supernova.jpg?fit=320%2C321&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-1d4","jetpack-related-posts":[{"id":4753,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-mammouths-auraient-disparu-a-cause-dune-comete\/","url_meta":{"origin":4654,"position":0},"title":"Les mammouths auraient disparu \u00e0 cause d&rsquo;une com\u00e8te","author":"Admin","date":"2 f\u00e9vrier 2009","format":false,"excerpt":"En 2007, un ar\u00e9opage constitu\u00e9 de 26 membres de 16 institutions avait pr\u00e9sent\u00e9 une s\u00e9rie d\u2019arguments extr\u00eamement convaincants concernant la disparition des mammouths nord-am\u00e9ricains. Un nouvel article publi\u00e9 dans Science confirme \u00e0 nouveau la pr\u00e9sence de grandes quantit\u00e9s de nanodiamants, indice de la chute d\u2019un corps c\u00e9leste, dans les couches\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/NewMeteorCraterMinn.gif?fit=600%2C464&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/NewMeteorCraterMinn.gif?fit=600%2C464&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/NewMeteorCraterMinn.gif?fit=600%2C464&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":19771,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-derniers-mammouth-ont-disparu-il-y-a-4000-ans\/","url_meta":{"origin":4654,"position":1},"title":"Les derniers Mammouth ont disparu il y a 4000 ans","author":"Admin","date":"6 novembre 2019","format":false,"excerpt":"Les derniers mammouths laineux vivaient sur l'\u00eele Wrangel dans l'oc\u00e9an Arctique; ils sont morts il y a 4000 ans et en tr\u00e8s peu de temps. Une \u00e9quipe de recherche internationale des universit\u00e9s d'Helsinki, de T\u00fcbingen et de l'Acad\u00e9mie des sciences de Russie a maintenant reconstitu\u00e9 le sc\u00e9nario qui aurait pu\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/mammouth-1.jpg?fit=1180%2C738&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/mammouth-1.jpg?fit=1180%2C738&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/mammouth-1.jpg?fit=1180%2C738&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/mammouth-1.jpg?fit=1180%2C738&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/mammouth-1.jpg?fit=1180%2C738&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":22091,"url":"https:\/\/www.laterredufutur.com\/accueil\/sans-les-humains-les-mammouths-auraient-vecu-4000-ans-de-plus\/","url_meta":{"origin":4654,"position":2},"title":"Sans les humains, les mammouths auraient v\u00e9cu 4000 ans de plus","author":"Admin","date":"28 f\u00e9vrier 2021","format":false,"excerpt":"Une \u00e9quipe de chercheurs internationaux a utilis\u00e9 des simulations informatiques pour d\u00e9montrer qu'il existait probablement une combinaison avec le changement climatique et la chasse humaine qui aurait conduit \u00e0 l'extinction du mammouth laineux. Ils ont r\u00e9dig\u00e9 un article d\u00e9crivant leurs d\u00e9couvertes, disponible sur le serveur de pr\u00e9-impression bioRxiv - dans\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/mammouth.jpg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/mammouth.jpg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/mammouth.jpg?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/mammouth.jpg?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/mammouth.jpg?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":2652,"url":"https:\/\/www.laterredufutur.com\/accueil\/extinction-en-serie\/","url_meta":{"origin":4654,"position":3},"title":"Extinction en s\u00e9rie","author":"Admin","date":"16 janvier 2005","format":false,"excerpt":"Depuis 15000 ans, de nombreuses esp\u00e8ces ont disparu de la surface de la Terre. La Terre a \u00e9t\u00e9 balay\u00e9e par de nombreuses glaciations et retour au chaud. L'Homme a du s'adapter \u00e0 ces divers climats. Grace \u00e0 de nombreuses esp\u00e8ces, il a pu rester en vie \u00e0 leur d\u00e9triment. Mais\u2026","rel":"","context":"Dans &quot;Ecologie&quot;","block_context":{"text":"Ecologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/ecologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/felinsaut.gif?fit=257%2C220&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":23528,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-mammouths-et-les-chevaux-anciens-ont-disparu-il-y-a-6000-ans\/","url_meta":{"origin":4654,"position":4},"title":"Les Mammouths et les chevaux anciens ont disparu il y a 6000 ans","author":"Admin","date":"11 d\u00e9cembre 2021","format":false,"excerpt":"Une nouvelle \u00e9tude s'int\u00e9ressant \u00e0 l'ADN recueilli dans le perg\u00e9lisol r\u00e9v\u00e8le que les mammouths et les chevaux anciens d'Am\u00e9rique du Nord auraient disparu il y a 6000 ans, et non 13 000 ans, comme l'affirmaient des \u00e9tudes s'int\u00e9ressant \u00e0 de l'ADN retrouv\u00e9 dans des archives osseuses. Une \u00e9quipe de scientifiques\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/mammouth.jpeg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/mammouth.jpeg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/mammouth.jpeg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/mammouth.jpeg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/mammouth.jpeg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":11027,"url":"https:\/\/www.laterredufutur.com\/accueil\/lhomme-aurait-fait-disparaitre-les-mammouths\/","url_meta":{"origin":4654,"position":5},"title":"L&rsquo;Homme aurait fait dispara\u00eetre les mammouths","author":"Admin","date":"12 f\u00e9vrier 2016","format":false,"excerpt":"La fin de l'\u00e8re glaciaire ne serait en fait pas la cause de l'extinction des pachydermes. Le r\u00e9chauffement climatique a bon dos. En tout cas en ce qui concerne l\u2019extinction des mammouths. La myst\u00e9rieuse disparition des pachydermes est une des plus longues enqu\u00eates de l\u2019histoire, que les scientifiques et arch\u00e9ologues\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/chasse-aux-mammouths.jpg?fit=930%2C442&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/chasse-aux-mammouths.jpg?fit=930%2C442&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/chasse-aux-mammouths.jpg?fit=930%2C442&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/chasse-aux-mammouths.jpg?fit=930%2C442&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4654","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=4654"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4654\/revisions"}],"predecessor-version":[{"id":4656,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4654\/revisions\/4656"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/4655"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=4654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=4654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=4654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}