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Dust storm of the surface of Titan, illustration. Titan, the largest moon of Saturn, is the only body in the known Solar System, aside from Earth, with liquid on its surface. But it's not water; it's liquid hydrocarbons. It's also the only satellite with a substantial atmosphere, made mostly of nitrogen. Scientists studying data from the Cassini mission by ESA have found dust storms raging around the moon's equator, as depicted in this illustration. Saturn is shown in the sky, although in reality it is unlikely it would be visible owing to the dense cloud coverage.