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Saturn's icy moon Enceladus, already known for spitting plumes of water into space, just got even more interesting. New gravity readings suggest it hosts a subsurface sea the size of Lake Superior at its south pole - and that this liquid water is in direct contact with the moon's core, which is rich in nutrients. Both findings boost hopes that the sea hosts life.

The result comes hot on the heels of the discovery late last year that a second icy moon – Europa, which orbits Jupiter – also spews plumes of water. Both moons are now among the hottest prospects in the solar system for finding alien life – if only a suitable mission could be arranged.

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