La glace antarctique révèle que la Terre traverse des débris de supernova

14 mai 2026

Rapporté par l'IA

Des scientifiques ont détecté des traces de fer-60 dans la glace antarctique vieille de 80 000 ans, démontrant que le système solaire traverse des matériaux issus d'une ancienne explosion stellaire. Ces conclusions proviennent d'une étude publiée dans Physical Review Letters et désignent le Nuage interstellaire local comme la source de cet isotope radioactif.

Une équipe internationale du Helmholtz-Zentrum Dresden-Rossendorf a dirigé l'analyse de carottes de glace prélevées dans le cadre du projet européen EPICA. Les échantillons, formés il y a entre 40 000 et 80 000 ans, contenaient des niveaux de fer-60 inférieurs aux mesures plus récentes. Cet isotope, qui ne se forme que lors d'explosions de supernovas, avait été précédemment découvert dans de la neige et des sédiments plus récents, laissant son origine incertaine jusqu'à présent.

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jeudi 14 mai 2026 11h51