{"id":19045,"date":"2026-02-08T13:21:00","date_gmt":"2026-02-08T11:21:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=19045"},"modified":"2026-02-12T09:15:36","modified_gmt":"2026-02-12T07:15:36","slug":"entretien-le-risque-quun-asteroide-impacte-la-terre-est-faible-mais-pas-nul","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/02\/08\/entretien-le-risque-quun-asteroide-impacte-la-terre-est-faible-mais-pas-nul\/","title":{"rendered":"[Entretien] \u00ab&nbsp;Le risque qu\u2019un ast\u00e9ro\u00efde impacte la Terre est faible, mais pas nul&nbsp;\u00bb"},"content":{"rendered":"<div class=\"paragraph\">\n<p><b>La Marseillaise<\/b><b>\u00a0<\/b><b>:<\/b><b> La d\u00e9fense plan\u00e9taire, qui consiste \u00e0 \u00e9tudier les objets g\u00e9ocroiseurs \u2013 dont l\u2019orbite croise celle de la Terre \u2013 et \u00e0 pr\u00e9parer des moyens de les d\u00e9vier, est-il un sujet s\u00e9rieux<\/b><b>\u00a0<\/b><b>?<\/b><\/p>\n<p><b>Patrick Michel<\/b><b>\u00a0<\/b><b>:<\/b> C\u2019est tr\u00e8s s\u00e9rieux\u00a0! Les \u00c9tats-Unis ont \u00e9t\u00e9 les premiers \u00e0 consid\u00e9rer ce risque, d\u00e8s 1998. Et cela se d\u00e9veloppe ces derni\u00e8res ann\u00e9es\u00a0: plusieurs missions ont \u00e9t\u00e9 lanc\u00e9es ou sont en cours de pr\u00e9paration. L\u2019Agence spatiale japonaise a cr\u00e9\u00e9 un groupe de d\u00e9fense plan\u00e9taire en 2024 et monte une mission\u00a0: Destiny+. La Chine en pr\u00e9voit une pour 2029. L\u2019Italie est tr\u00e8s motrice. L\u2019Allemagne y vient aussi. En France, le sujet a longtemps \u00e9t\u00e9 ignor\u00e9, mais cela change.<\/p>\n<p><b>Arriverait-on \u00e0 d\u00e9vier un ast\u00e9ro\u00efde qui se dirigerait vers la Terre<\/b><b>\u00a0<\/b><b>? <\/b><\/p>\n<p><b>P.M.<\/b><b>\u00a0<\/b><b>:<\/b> Nous le pensons. Tout est une question de timing\u00a0: il faut le d\u00e9tecter suffisamment t\u00f4t car, avec les techniques envisag\u00e9es, la d\u00e9viation est lente. La mission am\u00e9ricaine Dart a test\u00e9 l\u2019envoi d\u2019une sonde \u00e0 haute vitesse pour impacter un ast\u00e9ro\u00efde et le d\u00e9tourner. Nous savons que sa trajectoire a chang\u00e9. La mission Hera observera les d\u00e9tails de ce r\u00e9sultat cette ann\u00e9e. D\u2019autres solutions sont \u00e9tudi\u00e9es\u00a0: le faisceau d\u2019ions, le tracteur gravitationnel voire l\u2019explosion d\u2019une bombe nucl\u00e9aire \u2013 qui serait utilis\u00e9e en dernier recours.<\/p>\n<p><b>Quelle est l\u2019ampleur du risque<\/b><b>\u00a0<\/b><b>? <\/b><\/p>\n<p><b>P.M.<\/b><b>\u00a0<\/b><b>:<\/b> Il est faible, rassurons-nous, mais pas nul. Cela arrivera sur le long terme. Alors autant se pr\u00e9parer tout de suite pour les g\u00e9n\u00e9rations futures. D\u2019autant que cela semble \u00e0 notre port\u00e9e avec des moyens et des efforts raisonnables.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"La Marseillaise&nbsp;: La d&eacute;fense plan&eacute;taire, qui consiste &agrave; &eacute;tudier les objets g&eacute;ocroiseurs &ndash; dont l&rsquo;orbite croise celle de la Terre &ndash; et &agrave; pr&eacute;parer des moyens de les d&eacute;vier, &#8230;","protected":false},"author":1,"featured_media":19046,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3926,3925,20],"tags":[4767,1058],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-19045","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil-merge","category-accueil-third","category-societe","tag-asteroide","tag-science","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/19045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=19045"}],"version-history":[{"count":1,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/19045\/revisions"}],"predecessor-version":[{"id":19047,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/19045\/revisions\/19047"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/19046"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=19045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=19045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=19045"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=19045"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=19045"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=19045"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=19045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}