{"id":45056,"date":"2023-05-30T19:23:44","date_gmt":"2023-05-30T19:23:44","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/la-planete-terre-grossit-elle-ou-perd-elle-de-la-masse"},"modified":"2023-05-30T20:40:22","modified_gmt":"2023-05-30T20:40:22","slug":"la-planete-terre-grossit-elle-ou-perd-elle-de-la-masse","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/la-planete-terre-grossit-elle-ou-perd-elle-de-la-masse","title":{"rendered":"La plan\u00e8te Terre grossit-elle ou perd-elle de la masse ?"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span><b>Le poids de la Terre e\u0301volue en permanence<\/b><\/p>\n<p>6 000 000 000 000 000 000 000 000 kg. Soit environ 6.000 milliards de milliards de tonnes. C\u2019est le poids estime\u0301 de la Terre par les scientifiques. Et 45% de cette masse est due a\u0300 celle du noyau uniquement, selon les donne\u0301es de l\u2019instrument IceCube publie\u0301es en 2018.<\/p>\n<p>Mais la masse de notre plane\u0300te n\u2019est pas stable, elle e\u0301volue en permanence. L\u2019on pourrait penser que la Terre pe\u0300se de plus en plus lourd, notamment a\u0300 cause de la technosphe\u0300re, c\u2019est-a\u0300-dire \u201cl\u2019ensemble des structures que les humains ont construites pour les maintenir en vie, en tre\u0300s grand nombre maintenant, sur la plane\u0300te : les maisons, les usines, les fermes, les mines, les routes, les ae\u0301roports et les ports d\u2019expe\u0301dition, les syste\u0300mes informatiques et leurs de\u0301chets&#8230;\u201d, pre\u0301cisait en 2016 Jan Zalasiewicz, chercheur au de\u0301partement de ge\u0301ologie de l\u2019Universite\u0301 de Leicester (Royaume-Uni) dans une e\u0301tude. Ce scientifique a d\u2019ailleurs estime\u0301 le poids de la technosphe\u0300re a\u0300 30.000 milliards de tonnes, soit environ 50 kg par me\u0300tre carre\u0301 de surface terrestre.<\/p>\n<p><b>La Terre perd environ 55 000 tonnes chaque anne\u0301e<\/b><\/p>\n<p>En re\u0301alite\u0301, l\u2019humain a beau construire, il n\u2019ajoute aucun poids a\u0300 la Terre puisqu\u2019il utilise des mate\u0301riaux qui y e\u0301taient de\u0301ja\u0300 pre\u0301sents&#8230; En re\u0301alite\u0301, et de manie\u0300re peu intuitive, la Terre perd du poids chaque anne\u0301e ! C\u2019est la conclusion de deux chercheurs de l\u2019Universite\u0301 de Cambridge, Chris Smith, microbiologiste, et Dave Ansel, physicien. Dans un article de la BBC, ils expliquent que, me\u0302me si notre plane\u0300te gagne environ 40 000 tonnes par an rien qu\u2019en comptabilisant les poussie\u0300res venues de l\u2019espace et tombant a\u0300 la surface, la Terre perd davantage de masse : environ 55 000 tonnes de matie\u0300re par an (environ 140 tonnes par jour).<\/p>\n<p>L\u2019on peut citer trois causes a\u0300 cette perte de masse. Les deux premie\u0300res sont ne\u0301gligeables : il s\u2019agit de la hausse de l\u2019e\u0301nergie de la Terre lie\u0301e a\u0300 son re\u0301chauffement (160 tonnes par an) et l\u2019activite\u0301 du noyau central (qui consomme de l\u2019e\u0301nergie et induit une perte de masse de 16 tonnes par an). La dernie\u0300re, en revanche, est majeure : il s\u2019agit de la perte des atomes d\u2019hydroge\u0300ne et d\u2019he\u0301lium, pas assez lourds pour que la gravite\u0301 terrestre les retienne e\u0301ternellement dans l\u2019atmosphe\u0300re. Ainsi, 95 000 tonnes d\u2019hydroge\u0300ne et 1 500 tonnes d\u2019he\u0301lium quittent la Terre chaque anne\u0301e !<\/p>\n<p>\u201cLa perte de masse de la Terre en une anne\u0301e (55 000 tonnes, ndlr) ne repre\u0301sente que la moitie\u0301 de la masse d\u2019un seul paquebot, relativise Andre\u0301 Mousset, physicien au muse\u0301e national d\u2019histoire naturelle du Luxembourg, sur le site de vulgarisation scientifique Science.lu. Compare\u0301 a\u0300 la masse de la Terre elle-me\u0302me, cet amaigrissement est infime. Sa perte de masse ne de\u0301passe pas les 0,000 000 000 000 001 % par an.\u201d Quant a\u0300 la fuite d\u2019hydroge\u0300ne, inutile de paniquer : il nous en reste assez pour tenir encore des milliards d\u2019anne\u0301es.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/senegal\">Senegal<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Le poids de la Terre e\u0301volue en permanence 6 000 000 000 000 000 000 000 000 kg. Soit environ 6.000 milliards de milliards de tonnes. C\u2019est le poids estime\u0301 de la Terre par les scientifiques. Et 45% de cette masse est due a\u0300 celle du noyau uniquement, selon les donne\u0301es de [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":45055,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[43,47,44],"class_list":["post-45056","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press-2","tag-africa-press-senegal","tag-senegal-2"],"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 plan\u00e8te Terre grossit-elle ou perd-elle de la masse ? - Senegal<\/title>\n<meta name=\"description\" content=\"Le poids de la Terre e\u0301volue en permanence 6 000 000 000 000 000 000 000 000 kg. 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