14 Titan has a liquid cycle

Another weird moon in Saturn’s system is Titan, which hosts a liquid ‘cycle’ that moves material between the atmosphere and the surface. That sounds a lot like Earth’s water cycle, but Titan’s immense lakes are filled with liquid methane and ethane, possibly over a layer of water. Researchers hope to use data from the Cassini-Huygens mission to tease out some of Titan’s secrets before designing a submarine that might one day plumb the depths of the mysterious moon.