{"id":369555,"date":"2025-09-06T02:06:12","date_gmt":"2025-09-06T02:06:12","guid":{"rendered":"https:\/\/www.europesays.com\/fr\/369555\/"},"modified":"2025-09-06T02:06:12","modified_gmt":"2025-09-06T02:06:12","slug":"la-decouverte-inattendue-dune-graine-devoile-les-entrailles-de-la-planete","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fr\/369555\/","title":{"rendered":"la d\u00e9couverte inattendue d\u2019une \u00abgraine\u00bb d\u00e9voile les entrailles de la plan\u00e8te"},"content":{"rendered":"

Une analyse pouss\u00e9e des donn\u00e9es enregistr\u00e9es il y a quelques ann\u00e9es par le sismom\u00e8tre fran\u00e7ais de la mission am\u00e9ricaine Insight r\u00e9v\u00e8le un c\u0153ur solide \u00e0 l\u2019int\u00e9rieur du noyau de la plan\u00e8te rouge, comme sur Terre.<\/p>\n

Pendant quatre ann\u00e9es, de 2018 \u00e0 2022, le sismom\u00e8tre fran\u00e7ais SEIS a patiemment enregistr\u00e9 les moindres tremblements de\u00a0Mars<\/a>\u00a0dans le cadre de la mission Insight de\u00a0la Nasa<\/a>. Pos\u00e9 \u00e0 m\u00eame le sol dans la plaine d\u2019Elysium, bien prot\u00e9g\u00e9 sous un couvercle aux allures de cloche de restaurant high-tech, l\u2019instrument a mesur\u00e9 \u00e0 cet endroit pr\u00e9cis toutes les vibrations du sol, aussi bien celles provoqu\u00e9es par le vent, que les impacts m\u00e9t\u00e9oritiques ou les s\u00e9ismes. En a r\u00e9sult\u00e9 une quantit\u00e9 consid\u00e9rable de donn\u00e9es sismologiques dont les chercheurs continuent d\u2019essayer de tirer toute la substantifique moelle, des ann\u00e9es apr\u00e8s\u00a0la fin de la mission<\/a>.<\/p>\n

Cela para\u00eet assez incroyable lorsqu\u2019on y pense, mais ces enregistrements devaient notamment permettre de d\u00e9terminer la structure interne de la plan\u00e8te. En effet, les vibrations ne se transmettent pas de la m\u00eame fa\u00e7on \u00e0 travers les couches internes. Leur vitesse et leur att\u00e9nuation d\u00e9pendent de la composition, de la temp\u00e9rature, de la densit\u00e9, de l\u2019\u00e9tat (liquide\u2026<\/p>\n

\n Cet article est r\u00e9serv\u00e9 aux abonn\u00e9s. Il vous reste 86% \u00e0 d\u00e9couvrir.\n <\/p>\n

\"Le<\/p>\n

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