Titan has clouds, rain and lakes, like Earth, but these are composed of methane rather than water. However, methane lakes were seen only at Titan's poles until now — its tropics around the equator were apparently home to dune fields instead.

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The question of how a subterranean aquifer might form on Titan is still unclear. "Titan's orbit about Saturn might give us a clue. It is not circular," Griffith said. Some scientists suggest that Titan's noncircular orbit was once even more ellip...
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