NASA's Cassini mission at Saturn has collected data that indicates that the largest moon of Saturn, Titan, probably has an underground ocean. The analysis of data returned during close flybys of the enigmatic moon led investigators to conclude that the best fit to the data they saw was the presence of a global underground ocean.
Titan has already captured our imagination and curiosity due to its huge lakes of liquid methane, opaque atmosphere and organic material believed to cover the surface of the large moon.
Scientists think that the subsurface ocean replenishes the methane in the atmosphere.
Read MoreAbout It: http://science.nasa.gov/science-news/science-at-nasa/2012/28jun_titanocean/ and http://www.jpl.nasa.gov/news/news.cfm?release=2012-190
Sky Guy in VA