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The October issue of "Sky & Telescope" has a nice article about potential oceans lurking on other planets.  Since most large moons of the outer giants have vast amounts of water, it's possible other moons have subsurface oceans.  Titan may have one, especially if a little ammonia is present to act as antifreeze (and there is sufficient radioactive heating from the core).  Apparently, a solution of 1 part ammonia to 2 parts water is very resilient to freezing (-100C!).
 
Only 650 days until Saturn Orbit Insertion of Cassini!   

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