This diagram shows Saturn's largest moon Titan using data from gravity measurements by NASA's Cassini probe, which suggest an underground water ocean exists on the satellite. Image released June 28, ... more 
This diagram shows Saturn's largest moon Titan using data from gravity measurements by NASA's Cassini probe, which suggest an underground water ocean exists on the satellite. Image released June 28, 2012. less 
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SPACE.com | Photo By A. Tavani
Thu, Jun 28, 2012 2:12 PM EDT