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Un océan d'eau liquide sous la surface d'Encelade, petite lune de Saturne

Un océan d'eau liquide sous la surface d'Encelade, petite lune de Saturne

Saturn's moon Dione always has one side that faces Saturn, and always has one side that faces away. This is similar to Earth's Moon. Dione should therefore have undergone a significant amount of impacts on its leading half. But the current leading half of Dione is less cratered than the trailing half! A possible explanation is that some impacts were so large they spun Dione, sometimes changing the part that suffered the highest impact rate before the moon's spin again became locked.

Saturn's moon Dione always has one side that faces Saturn, and always has one side that faces away. This is similar to Earth's Moon. Dione should therefore have undergone a significant amount of impacts on its leading half. But the current leading half of Dione is less cratered than the trailing half! A possible explanation is that some impacts were so large they spun Dione, sometimes changing the part that suffered the highest impact rate before the moon's spin again became locked.

La station spatiale internationale en transit devant la Lune

La station spatiale internationale en transit devant la Lune

Encelade photographié par Cassini. Selon un nouveau modèle, l’épaisseur de la banquise de ce satellite de Saturne de 500 km de diamètre atteint 35 km au niveau de son équateur et moins de 5 km dans la région active du pôle sud (rayures à gauche) où sont observés des geysers — Crédit : NASA, ESA, JPL, Cassini Imaging Team, SSI

L'océan d'Encelade serait recouvert d'une couche de glace plus fine que prévu

Encelade photographié par Cassini. Selon un nouveau modèle, l’épaisseur de la banquise de ce satellite de Saturne de 500 km de diamètre atteint 35 km au niveau de son équateur et moins de 5 km dans la région active du pôle sud (rayures à gauche) où sont observés des geysers — Crédit : NASA, ESA, JPL, Cassini Imaging Team, SSI

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