astroengine (1577233) writes "Gravity measurements made with the Saturn-orbiting Cassini spacecraft indicate the small moon Enceladus has an ocean sandwiched between its rocky core and icy shell, a finding that raises the prospects of a niche for life beyond Earth. The Cassini data shows the body of water, which is in the moon's southern hemisphere, must be as large or larger than Lake Superior and sitting on top of the moon's rocky core at a depth of about 31 miles. 'The ocean may extend halfway or more toward the equator in every direction,' said planetary scientist David Stevenson, with the California Institute of Technology in Pasadena."
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