The puzzling rivers of Titan

Cassini radar image showing some of Titan’s river networks draining into lakes in the north polar region.
Credit: NASA / JPL / USGS

Just like Earth, Saturn’s moon Titan has rivers, lots of them, as well as lakes and seas. Appearance-wise, they look just like their earthly counterparts, but there is one big difference – they are composed of liquid methane instead of water. Titan is far too cold for liquid water on its surface, although there is probably a subsurface ocean.

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