Buried underneath miles of ice, there is a liquid sea the size of Lake Superior. Scientists had previously suspected Enceladus may have an underground ocean.
This latest study calculated the density of material in different parts of Enceladus after three gravity-measuring flybys.
Those measurements revealed there's something underneath Enceladus' ice in the south that's denser than the ice.
Liquid water is the most likely explanation, says David Stevenson, a planetary scientist at the California Institute of Technology who also worked on the study.
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