This undated photo provided by NASA on April 2, 2014 shows Saturn's moon Enceladus. The "tiger stripes" are long fractures from which water vapor jets are emitted. 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, Space Science Institute)
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