SUMMARY: Thanks to data gathered by Cassini and Huygens, scientists know that Titan's atmosphere contains significant amounts of ammonia - and this chemical could be responsible for the weathering on the moon's surface. Researchers from the University of Arizona believe that Cassini will eventually find that Titan has a layer of liquid ammonia-and-water underneath a solid crust of water ice. It's this liquid ammonia that could be creating the cryovolcanic flows discovered by Cassini on its first close Titan flyby in 2004.

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