{"id":26968,"date":"2025-06-11T12:00:39","date_gmt":"2025-06-11T10:00:39","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=26968"},"modified":"2025-06-09T09:20:43","modified_gmt":"2025-06-09T07:20:43","slug":"une-vague-extraterrestre-geante-a-frappe-la-terre-il-y-a-14-millions-dannees-et-pourrait-avoir-radicalement-modifie-le-climat-de-notre-planete","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-vague-extraterrestre-geante-a-frappe-la-terre-il-y-a-14-millions-dannees-et-pourrait-avoir-radicalement-modifie-le-climat-de-notre-planete\/","title":{"rendered":"Une \u00ab vague \u00bb extraterrestre g\u00e9ante a frapp\u00e9 la Terre il y a 14 millions d&rsquo;ann\u00e9es et pourrait avoir radicalement modifi\u00e9 le climat de notre plan\u00e8te"},"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>Le voyage de notre syst\u00e8me solaire autour du centre de la Voie lact\u00e9e le fait traverser diff\u00e9rents environnements galactiques, et l&rsquo;un d&rsquo;eux pourrait avoir eu un impact durable sur le climat de la Terre, selon une nouvelle \u00e9tude. Comme un navire naviguant \u00e0 travers des conditions m\u00e9t\u00e9orologiques changeantes en mer, le voyage de notre syst\u00e8me solaire autour du centre de la Voie lact\u00e9e le fait traverser des environnements galactiques vari\u00e9s &#8211; et l&rsquo;un d&rsquo;entre eux pourrait avoir eu un impact durable sur le climat de la Terre, sugg\u00e8re une nouvelle \u00e9tude.<\/p>\n<p>Les observations de la mission Gaia de l&rsquo; Agence spatiale europ\u00e9enne, r\u00e9cemment retir\u00e9e du service, indiquent qu&rsquo;il y a environ 14 millions d&rsquo;ann\u00e9es, notre syst\u00e8me solaire a travers\u00e9 une r\u00e9gion dense de formation d&rsquo;\u00e9toiles en direction de la constellation d&rsquo;Orion. Cette r\u00e9gion fait partie d&rsquo;un vaste r\u00e9seau d&rsquo;amas d&rsquo;\u00e9toiles qui s&rsquo;\u00e9tend sur pr\u00e8s de 9 000 ann\u00e9es-lumi\u00e8re et est sculpt\u00e9e dans une structure que les astronomes ont baptis\u00e9e \u00ab onde de Radcliffe \u00bb, en l&rsquo;honneur du Harvard Radcliffe Institute, dans le Massachusetts, o\u00f9 son existence a \u00e9t\u00e9 confirm\u00e9e.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26969\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-vague-extraterrestre-geante-a-frappe-la-terre-il-y-a-14-millions-dannees-et-pourrait-avoir-radicalement-modifie-le-climat-de-notre-planete\/onde-de-radcliffe\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?fit=1024%2C1024&amp;ssl=1\" data-orig-size=\"1024,1024\" 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=\"onde de Radcliffe\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?fit=800%2C800&amp;ssl=1\" class=\"alignnone size-full wp-image-26969\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?resize=1024%2C1024&#038;ssl=1\" alt=\"\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?w=1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?resize=800%2C800&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe.jpg?resize=144%2C144&amp;ssl=1 144w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Lorsque notre syst\u00e8me solaire a travers\u00e9 cette structure il y a des millions d&rsquo;ann\u00e9es, il a peut-\u00eatre re\u00e7u un flux accru de poussi\u00e8re interstellaire. La chronologie de cet \u00e9v\u00e9nement co\u00efncide avec la transition de la Terre d&rsquo;un climat plus chaud \u00e0 un climat plus froid, comme en t\u00e9moigne l&rsquo; expansion de la calotte glaciaire de l&rsquo;Antarctique . Cela soul\u00e8ve la possibilit\u00e9 que cette rencontre ait contribu\u00e9 \u00e0 ce changement climatique, de concert avec plusieurs autres facteurs et processus en cours, avance la nouvelle \u00e9tude.<\/p>\n<p>Des recherches plus pouss\u00e9es pourraient permettre de v\u00e9rifier cette th\u00e9orie. Si des abondances inhabituellement \u00e9lev\u00e9es d&rsquo;\u00e9l\u00e9ments radioactifs \u2013 attendues suite \u00e0 un afflux de poussi\u00e8re aussi important \u2013 \u00e9taient effectivement d\u00e9tect\u00e9es dans les archives g\u00e9ologiques de notre plan\u00e8te, cela renforcerait l&rsquo;hypoth\u00e8se de l&rsquo;\u00e9tude, \u00ab car nous disposerions d&rsquo;une signature g\u00e9ologique et d&rsquo;une perspective astronomique permettant de l&rsquo;expliquer \u00bb, a d\u00e9clar\u00e9 \u00e0 Live Science Efrem Maconi , auteur principal de l&rsquo;\u00e9tude et doctorant en astrophysique \u00e0 l&rsquo;Universit\u00e9 de Vienne.<\/p>\n<p>Lui et ses coll\u00e8gues ont d\u00e9crit ces r\u00e9sultats dans un article publi\u00e9 le mois dernier dans la revue Astronomy &amp; Astrophysics . Cependant, il ne sera pas facile de rep\u00e9rer cette preuve cruciale dans les archives g\u00e9ologiques de notre plan\u00e8te \u2013 un pic vieux de 14 millions d&rsquo;ann\u00e9es dans l&rsquo;abondance d&rsquo;un isotope rare du fer appel\u00e9 fer 60, fr\u00e9quemment lib\u00e9r\u00e9 par les supernovas mais extr\u00eamement rare sur Terre.<\/p>\n<p>\u00ab Remonter le temps est difficile, que ce soit dans l&rsquo;espace ou en Antarctique \u00bb, a d\u00e9clar\u00e9 \u00e0 Live Science Teddy Kareta , astronome \u00e0 l&rsquo;observatoire Lowell en Arizona, qui n&rsquo;a pas particip\u00e9 \u00e0 la nouvelle recherche. \u00ab C&rsquo;est un sc\u00e9nario tr\u00e8s prometteur, mais trouver des preuves concr\u00e8tes de son impact sur le climat terrestre, ou m\u00eame \u00e9valuer l&rsquo;augmentation du flux de poussi\u00e8re qu&rsquo;a connu le syst\u00e8me solaire, pourrait demander beaucoup de temps et de travail de la part de toutes les disciplines scientifiques. \u00bb<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26971\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-vague-extraterrestre-geante-a-frappe-la-terre-il-y-a-14-millions-dannees-et-pourrait-avoir-radicalement-modifie-le-climat-de-notre-planete\/onde-de-radcliffe-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe-1.jpg?fit=480%2C480&amp;ssl=1\" data-orig-size=\"480,480\" 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=\"onde de Radcliffe\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe-1.jpg?fit=480%2C480&amp;ssl=1\" class=\"size-full wp-image-26971 aligncenter\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe-1.jpg?resize=480%2C480&#038;ssl=1\" alt=\"\" width=\"480\" height=\"480\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe-1.jpg?w=480&amp;ssl=1 480w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe-1.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/onde-de-Radcliffe-1.jpg?resize=144%2C144&amp;ssl=1 144w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><\/p>\n<p>\u00ab Nous parlons vraiment d&rsquo;hier \u00bb<br \/>\nM\u00eame si l&rsquo;onde de Radcliffe se trouve dans notre arri\u00e8re-cour galactique, \u00e0 seulement 400 ann\u00e9es-lumi\u00e8re, les astronomes ne l&rsquo;ont remarqu\u00e9e qu&rsquo;en 2020 gr\u00e2ce \u00e0 la capacit\u00e9 du t\u00e9lescope Gaia \u00e0 d\u00e9terminer les distances et les vitesses des nuages \u200b\u200bde gaz connus pour la formation d&rsquo;\u00e9toiles, ce qui a permis aux astronomes de cr\u00e9er une carte 3D du voisinage solaire.<\/p>\n<p>\u00c0 l&rsquo;aide des donn\u00e9es les plus r\u00e9centes de Gaia, Maconi et ses coll\u00e8gues ont simul\u00e9 le parcours de 56 jeunes amas d&rsquo;\u00e9toiles associ\u00e9s \u00e0 l&rsquo;onde de Radcliffe, en suivant leurs orbites actuelles dans la Voie lact\u00e9e et leurs trajectoires pr\u00e9natales, d\u00e9duites de leurs nuages \u200b\u200bmol\u00e9culaires d&rsquo;origine. Cela a permis aux chercheurs de \u00ab remonter le temps et de voir o\u00f9 ils se situaient par rapport au syst\u00e8me solaire \u00bb, a expliqu\u00e9 Maconi.<\/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>Les chercheurs ont d\u00e9couvert que notre syst\u00e8me solaire \u00e9tait \u00e0 son point le plus proche de la r\u00e9gion d&rsquo;Orion il y a environ 14 millions d&rsquo;ann\u00e9es, \u00e0 moins de 65 ann\u00e9es-lumi\u00e8re d&rsquo;au moins deux amas d&rsquo;\u00e9toiles locaux riches en poussi\u00e8re : NGC 1980 et NGC 1981. \u00c0 cette \u00e9poque, notre syst\u00e8me solaire \u00e9tait en grande partie tel qu&rsquo;il est aujourd&rsquo;hui ; la Terre et les autres plan\u00e8tes s&rsquo;\u00e9taient form\u00e9es il y a plus de 4 milliards d&rsquo;ann\u00e9es. Pourtant, en termes cosmiques, \u00ab nous parlons vraiment d&rsquo;hier \u00bb, a d\u00e9clar\u00e9 Maconi.<\/p>\n<p>Les simulations sugg\u00e8rent que notre syst\u00e8me solaire a pass\u00e9 environ un million d&rsquo;ann\u00e9es dans cette r\u00e9gion dense, co\u00efncidant avec la transition de notre plan\u00e8te, au Mioc\u00e8ne moyen, d&rsquo;un climat plus chaud \u00e0 un climat plus froid. Cela sugg\u00e8re qu&rsquo;une importante quantit\u00e9 de poussi\u00e8re interstellaire aurait pu bloquer une partie du rayonnement solaire, acc\u00e9l\u00e9rant ainsi le refroidissement plan\u00e9taire, selon la nouvelle \u00e9tude.<\/p>\n<p>\u00ab Sugg\u00e9rer une influence galactique sur le climat de la Terre est une affirmation ambitieuse \u00bb, a d\u00e9clar\u00e9 Kareta. \u00ab Mais la concordance temporelle entre les deux \u00e9v\u00e9nements devrait certainement inciter les astronomes et les g\u00e9ologues \u00e0 tenter d&rsquo;\u00e9valuer plus en profondeur la probabilit\u00e9 de ce sc\u00e9nario. \u00bb<\/p>\n<figure id=\"attachment_26972\" aria-describedby=\"caption-attachment-26972\" style=\"width: 1024px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26972\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-vague-extraterrestre-geante-a-frappe-la-terre-il-y-a-14-millions-dannees-et-pourrait-avoir-radicalement-modifie-le-climat-de-notre-planete\/nebuleuse-orion\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?fit=1024%2C1024&amp;ssl=1\" data-orig-size=\"1024,1024\" 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;This dramatic image offers a peek inside a cavern of roiling dust and gas where thousands of stars are forming. The image, taken by the Advanced Camera for Surveys (ACS) aboard NASA\/ESA Hubble Space Telescope, represents the sharpest view ever taken of this region, called the Orion Nebula. More than 3,000 stars of various sizes appear in this image. Some of them have never been seen in visible light. These stars reside in a dramatic dust-and-gas landscape of plateaus, mountains, and valleys that are reminiscent of the Grand Canyon. The Orion Nebula is a picture book of star formation, from the massive, young stars that are shaping the nebula to the pillars of dense gas that may be the homes of budding stars. The bright central region is the home of the four heftiest stars in the nebula. The stars are called the Trapezium because they are arranged in a trapezoid pattern. Ultraviolet light unleashed by these stars is carving a cavity in the nebula and disrupting the growth of hundreds of smaller stars. Located near the Trapezium stars are stars still young enough to have disks of material encircling them. These disks are called protoplanetary disks or \\&quot;proplyds\\&quot; and are too small to see clearly in this image. The disks are the building blocks of solar systems. The bright glow at upper left is from M43, a small region being shaped by a massive, young star&#039;s ultraviolet light. Astronomers call the region a miniature Orion Nebula because only one star is sculpting the landscape. The Orion Nebula has four such stars. Next to M43 are dense, dark pillars of dust and gas that point toward the Trapezium. These pillars are resisting erosion from the Trapezium&#039;s intense ultraviolet light. The glowing region on the right reveals arcs and bubbles formed when stellar winds - streams of charged particles ejected from the Trapezium stars - collide with material. The faint red stars near the bottom are the myriad brown dwarfs that Hubble spied for the first time in the nebula in visible light. Sometimes called \\&quot;failed stars,\\&quot; brown dwarfs are cool objects that are too small to be ordinary stars because they cannot sustain nuclear fusion in their cores the way our Sun does. The dark red column, below, left, shows an illuminated edge of the cavity wall. The Orion Nebula is 1,500 light-years away, the nearest star-forming region to Earth. Astronomers used 520 Hubble images, taken in five colours, to make this picture. They also added ground-based photos to fill out the nebula. The ACS mosaic covers approximately the apparent angular size of the full moon. The Orion observations were taken between 2004 and 2005.&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=\"nebuleuse orion\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;This dramatic image offers a peek inside a cavern of roiling dust and gas where thousands of stars are forming. The image, taken by the Advanced Camera for Surveys (ACS) aboard NASA\/ESA Hubble Space Telescope, represents the sharpest view ever taken of this region, called the Orion Nebula. More than 3,000 stars of various sizes appear in this image. Some of them have never been seen in visible light. These stars reside in a dramatic dust-and-gas landscape of plateaus, mountains, and valleys that are reminiscent of the Grand Canyon. The Orion Nebula is a picture book of star formation, from the massive, young stars that are shaping the nebula to the pillars of dense gas that may be the homes of budding stars. The bright central region is the home of the four heftiest stars in the nebula. The stars are called the Trapezium because they are arranged in a trapezoid pattern. Ultraviolet light unleashed by these stars is carving a cavity in the nebula and disrupting the growth of hundreds of smaller stars. Located near the Trapezium stars are stars still young enough to have disks of material encircling them. These disks are called protoplanetary disks or \u00ab\u00a0proplyds\u00a0\u00bb and are too small to see clearly in this image. The disks are the building blocks of solar systems. The bright glow at upper left is from M43, a small region being shaped by a massive, young star&amp;rsquo;s ultraviolet light. Astronomers call the region a miniature Orion Nebula because only one star is sculpting the landscape. The Orion Nebula has four such stars. Next to M43 are dense, dark pillars of dust and gas that point toward the Trapezium. These pillars are resisting erosion from the Trapezium&amp;rsquo;s intense ultraviolet light. The glowing region on the right reveals arcs and bubbles formed when stellar winds &amp;#8211; streams of charged particles ejected from the Trapezium stars &amp;#8211; collide with material. The faint red stars near the bottom are the myriad brown dwarfs that Hubble spied for the first time in the nebula in visible light. Sometimes called \u00ab\u00a0failed stars,\u00a0\u00bb brown dwarfs are cool objects that are too small to be ordinary stars because they cannot sustain nuclear fusion in their cores the way our Sun does. The dark red column, below, left, shows an illuminated edge of the cavity wall. The Orion Nebula is 1,500 light-years away, the nearest star-forming region to Earth. Astronomers used 520 Hubble images, taken in five colours, to make this picture. They also added ground-based photos to fill out the nebula. The ACS mosaic covers approximately the apparent angular size of the full moon. The Orion observations were taken between 2004 and 2005.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?fit=800%2C800&amp;ssl=1\" class=\"size-full wp-image-26972\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?resize=1024%2C1024&#038;ssl=1\" alt=\"\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?w=1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?resize=800%2C800&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/06\/nebuleuse-orion.jpg?resize=144%2C144&amp;ssl=1 144w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-26972\" class=\"wp-caption-text\">The image, taken by the Advanced Camera for Surveys (ACS) aboard NASA\/ESA Hubble Space Telescope<\/figcaption><\/figure>\n<p>Une affirmation extraordinaire sans preuve extraordinaire \u2014 et pourtant<br \/>\n\u00ab Il existe des preuves raisonnables permettant de croire que le voyage de la Terre autour de la Voie lact\u00e9e a influenc\u00e9 sa g\u00e9ologie \u00bb, a d\u00e9clar\u00e9 \u00e0 Live Science Chris Kirkland , g\u00e9ologue \u00e0 l&rsquo;Universit\u00e9 Curtin en Australie, qui n&rsquo;a pas particip\u00e9 \u00e0 la nouvelle \u00e9tude.<\/p>\n<p>Par exemple, des recherches ant\u00e9rieures men\u00e9es par Kirkland sugg\u00e9raient que les impacts fr\u00e9quents et \u00e0 haute \u00e9nergie de m\u00e9t\u00e9orites durant la jeunesse de la Terre avaient contribu\u00e9 \u00e0 la formation de la cro\u00fbte continentale. Kirkland a toutefois refus\u00e9 de commenter l&rsquo;id\u00e9e que la poussi\u00e8re extraterrestre \u2013 par opposition aux impacts \u2013 ait pu influencer le climat terrestre.<\/p>\n<p>Dans la nouvelle \u00e9tude, Maconi et son \u00e9quipe ont not\u00e9 que la poussi\u00e8re extraterrestre atteignant la Terre devrait atteindre un pic d&rsquo;au moins six ordres de grandeur sup\u00e9rieur aux niveaux actuels pour expliquer pleinement les effets climatiques \u00e0 l&rsquo;\u00e9chelle plan\u00e9taire. Des influences plus subtiles et indirectes \u00e9taient plus probablement en jeu, et ces effets se seraient d\u00e9roul\u00e9s sur des centaines de milliers d&rsquo;ann\u00e9es, ce qui les distingue du changement climatique actuel, d&rsquo;origine humaine, a d\u00e9clar\u00e9 Maconi.<\/p>\n<p>Cependant, m\u00eame ces diff\u00e9rences sont difficiles \u00e0 d\u00e9chiffrer, principalement parce que les traces g\u00e9ologiques de l&rsquo;isotope r\u00e9v\u00e9lateur du fer 60 remontent \u00e0 environ 10 millions d&rsquo;ann\u00e9es. De plus, le fer 60 est instable, avec une demi-vie d&rsquo;environ 2,6 millions d&rsquo;ann\u00e9es, ce qui rend particuli\u00e8rement difficile la d\u00e9tection d&rsquo;un signal provenant d&rsquo;un \u00e9v\u00e9nement survenu il y a 14 millions d&rsquo;ann\u00e9es.<\/p>\n<p>\u00ab Les difficult\u00e9s que pose l&rsquo;\u00e9tude approfondie de l&rsquo;histoire du climat de la Terre limitent clairement notre capacit\u00e9 \u00e0 \u00e9valuer la probabilit\u00e9 que la vague de Radcliffe ait eu des effets climatologiques \u00e0 l&rsquo;heure actuelle \u00bb, a d\u00e9clar\u00e9 Kareta, \u00ab mais les progr\u00e8s de l&rsquo;instrumentation et des techniques d&rsquo;analyse nous permettront probablement de faire mieux \u00e0 l&rsquo;avenir. \u00bb<\/p>\n<p>Il existe peut-\u00eatre d&rsquo;autres endroits dans notre syst\u00e8me solaire qui, contrairement aux processus g\u00e9ologiques de recyclage du paysage terrestre, pourraient pr\u00e9server soit la poussi\u00e8re elle-m\u00eame, soit le pic r\u00e9v\u00e9lateur d&rsquo;\u00e9l\u00e9ments radioactifs extraterrestres, a ajout\u00e9 Kareta. Il pourrait s&rsquo;agir de crat\u00e8res profonds sur la Lune, notamment pr\u00e8s de ses p\u00f4les, qui ne re\u00e7oivent aucune lumi\u00e8re solaire tout au long de l&rsquo;ann\u00e9e et devraient, en principe, rester froids et stables sur de longues p\u00e9riodes, a-t-il ajout\u00e9.<\/p>\n<p>\u00ab Les processus \u00e0 l\u2019\u00e9chelle du syst\u00e8me solaire auraient d\u00fb laisser des preuves \u00e0 l\u2019\u00e9chelle du syst\u00e8me solaire \u00bb, a d\u00e9clar\u00e9 Kareta.<\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\" rel=\"noopener\">Terra Projects<\/a><\/p>\n<p>Source : <a href=\"https:\/\/www.livescience.com\/space\/astronomy\/a-giant-extraterrestrial-wave-hit-earth-14-million-years-ago-and-may-have-dramatically-altered-our-planets-climate\" target=\"_blank\" rel=\"noopener\">https:\/\/www.livescience.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"26968\">(188)<\/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>Le voyage de notre syst\u00e8me solaire autour du centre de la Voie lact\u00e9e le fait traverser diff\u00e9rents environnements galactiques, et&#8230;<\/p>\n","protected":false},"author":1,"featured_media":17058,"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":[20,22],"tags":[41,125,2545,8232,75],"class_list":["post-26968","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climat","category-espace","tag-climat","tag-galaxie","tag-poussiere","tag-poussiere-extraterrestre","tag-terre","wpcat-20-id","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-70Y","jetpack-related-posts":[{"id":26773,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-vague-interstellaire-geante-a-frappe-la-terre-il-y-a-14-millions-dannees-et-pourrait-avoir-radicalement-modifie-le-climat-de-notre-planete\/","url_meta":{"origin":26968,"position":0},"title":"Une \u00ab vague \u00bb interstellaire g\u00e9ante a frapp\u00e9 la Terre il y a 14 millions d&rsquo;ann\u00e9es et pourrait avoir radicalement modifi\u00e9 le climat de notre plan\u00e8te","author":"Admin","date":"19 mars 2025","format":false,"excerpt":"Le voyage de notre syst\u00e8me solaire autour du centre de la Voie lact\u00e9e l'am\u00e8ne \u00e0 traverser diff\u00e9rents environnements galactiques, dont l'un pourrait avoir eu un impact durable sur le climat de la Terre, selon une nouvelle \u00e9tude. \u00c0 l'instar d'un navire naviguant en mer dans des conditions m\u00e9t\u00e9orologiques changeantes, le\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/10\/galaxie-voie-lactee.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\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":17056,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-voie-lactee-pourrait-propager-la-vie-detoile-en-etoile\/","url_meta":{"origin":26968,"position":1},"title":"La voie lact\u00e9e pourrait propager la vie d&rsquo;\u00e9toile en \u00e9toile","author":"Admin","date":"16 octobre 2018","format":false,"excerpt":"Pendant pr\u00e8s de deux si\u00e8cles, les scientifiques ont \u00e9mis l'hypoth\u00e8se que les m\u00e9t\u00e9orites, les ast\u00e9ro\u00efdes, les plan\u00e9to\u00efdes et d'autres objets astronomiques pouvaient r\u00e9partir la vie dans tout l'univers. Cette th\u00e9orie, connue sous le nom de\u00a0Panspermie, est bas\u00e9e sur l\u2019id\u00e9e que les micro-organismes et les pr\u00e9curseurs chimiques de la vie peuvent\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\/2018\/10\/galaxie-voie-lactee.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\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/10\/galaxie-voie-lactee.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":27429,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-ondulation-colossale-deferle-a-travers-la-voie-lactee-selon-les-donnees-de-gaia\/","url_meta":{"origin":26968,"position":2},"title":"Une ondulation colossale d\u00e9ferle \u00e0 travers la Voie lact\u00e9e, selon les donn\u00e9es de Gaia","author":"Admin","date":"8 novembre 2025","format":false,"excerpt":"Les mouvements des \u00e9toiles de la Voie lact\u00e9e ont r\u00e9v\u00e9l\u00e9 une gigantesque ondulation vers l'ext\u00e9rieur, d\u00e9clench\u00e9e par un \u00e9v\u00e9nement massif survenu dans le pass\u00e9 tumultueux de notre galaxie. Dans une nouvelle analyse des donn\u00e9es recueillies par le vaisseau spatial de cartographie spatiale Gaia et d'une base de donn\u00e9es d'\u00e9toiles pulsantes,\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\/2025\/11\/ondulations-voie-lactee-1.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/11\/ondulations-voie-lactee-1.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/11\/ondulations-voie-lactee-1.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/11\/ondulations-voie-lactee-1.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/11\/ondulations-voie-lactee-1.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":490,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-monde-extraterrestre\/","url_meta":{"origin":26968,"position":3},"title":"Un monde extraterrestre","author":"Admin","date":"1 septembre 2011","format":false,"excerpt":"Notre univers, un vaste domaine d'exploration pour notre civilisation future, dans un monde qui aurait environ 200 milliards de galaxies et une galaxie comprendrait 200 milliards d'\u00e9toiles. Il est \u00e9galement estim\u00e9 qu'il y aurait 1570 milliards de plan\u00e8tes dans notre seule galaxie. L'ironie dans ces chiffres, c'est que cela serait\u2026","rel":"","context":"Dans &quot;Monde Futur&quot;","block_context":{"text":"Monde Futur","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/monde-futur\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10997,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-de-centaines-de-galaxies-cachees-par-la-voie-lactee\/","url_meta":{"origin":26968,"position":4},"title":"D\u00e9couverte de centaines de galaxies cach\u00e9es par la Voie Lact\u00e9e","author":"Admin","date":"19 f\u00e9vrier 2016","format":false,"excerpt":"Les astronomes ont utilis\u00e9 des ondes radio pour analyser la masse galactique et la poussi\u00e8re d\u2019\u00e9toile de la Voie lact\u00e9e. Et ils ont d\u00e9couvert qu\u2019il y avait des centaines de galaxies proches qui \u00e9taient cach\u00e9es. Cette d\u00e9couverte montre 883 galaxies qui ont \u00e9t\u00e9 observ\u00e9es par les scientifiques en utilisant le\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\/02\/collision_Voie_lactee_Andromede.jpg?fit=600%2C386&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/collision_Voie_lactee_Andromede.jpg?fit=600%2C386&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/collision_Voie_lactee_Andromede.jpg?fit=600%2C386&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":25152,"url":"https:\/\/www.laterredufutur.com\/accueil\/new-horizons-est-desormais-si-loin-quil-peut-mesurer-la-veritable-obscurite-de-lespace\/","url_meta":{"origin":26968,"position":5},"title":"New Horizons est d\u00e9sormais si loin qu&rsquo;il peut mesurer la v\u00e9ritable obscurit\u00e9 de l&rsquo;espace","author":"Admin","date":"20 ao\u00fbt 2023","format":false,"excerpt":"\u00c0 quel point le ciel nocturne est-il obscur ? Si vous sortez de chez vous par une nuit sans lune et que vous regardez en l'air, vous n'aurez probablement pas l'impression qu'il fait si sombre que cela. Les lampadaires ou les lampes des porches voisins remplissent l'air d'une lueur d'arri\u00e8re-plan,\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\/2020\/09\/galaxie.jpg?fit=1200%2C720&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/09\/galaxie.jpg?fit=1200%2C720&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/09\/galaxie.jpg?fit=1200%2C720&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/09\/galaxie.jpg?fit=1200%2C720&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/09\/galaxie.jpg?fit=1200%2C720&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26968","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=26968"}],"version-history":[{"count":2,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26968\/revisions"}],"predecessor-version":[{"id":26973,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26968\/revisions\/26973"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/17058"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=26968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=26968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=26968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}