This illustration provided by NASA and based on Cassini spacecraft measurements shows the possible interior of Saturn's moon Enceladus - an icy outer shell and a low density, rocky core with a regional water ocean sandwiched in between the two at southern latitudes. Plumes of water vapor and ice, first detected in 2005, are depicted in the south polar region. Scientists have uncovered a vast ocean beneath the icy surface of the moon, they announced Thursday, April 3, 2014. Italian and American researchers made the discovery using Cassini, a NASA-European spacecraft still exploring Saturn and its rings 17 years after its launch from Cape Canaveral. (AP Photo/NASA, JPL, Caltech)
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