NASA discovers subsurface ocean on Saturn's moon Titan
... NASA researchers examined data taken by Cassini of Titan during six close flybys. The largest of Saturn's moons, Titan rotates the planet every 16 days.
Researchers studied the moon's shape during different parts of its orbit. They found that because Titan is not spherical and is instead slightly elongated like a football, its axis grew slightly when it was closer to Saturn, and when it was further away from Saturn, the moon became nearly round in shape. Cassini was able to measure the gravitation effect of this squeeze and pull that was observed by the researchers.
One of the explanations for the change in Titan's shape is the possibility of subsurface tides similar to the ones found on Jupiter's moons. An ocean layer doesn't need to be huge or deep in order to create these tides, and a liquid layer between the external shell and solid mantle would allow Titan to bulge and compress as it orbits Saturn.
Due to the fact that Titan's surface is mostly made of water ice, it would make sense that Titan's subsurface ocean is mostly liquid water ...
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