Saturn’s ‘Death Star’ moon might contain a hidden ocean

An uncanny resemblance to the Death Star might not be the only intriguing thing about Saturn’s moon Mimas. It could also harbor a vast ocean of liquid water beneath its pockmarked exterior.

A new look at data from NASA’s Cassini probe reveals that the point in Mimas’ orbit where it comes closest to Saturn changed slightly over 13 years, researchers report February 7 in Nature. Because Mimas’ internal composition affects the gravitational dance between the moon and its planet, these orbital dynamics, along with some previously seen moon wobbles, point to a liquid interior, astronomer Valéry Lainey of the Paris Observatory and colleagues say.

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