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Summary
Orbiting Saturn, Cassini had "tasted" the plumes of salty water that spew from Enceladus's south polar region, so scientists had growing confidence that the plumes tap briny liquid water tens of kilometers beneath the surface. Now, analyses of Cassini measurements of undulations in Enceladus's gravity field point to a 10-kilometer-thick layer of water beneath the south polar region, if not the entire moon.
