Saturn has 83 moons. But one of them, Titan, is special. That’s because it’s the only moon in the entire solar system with a substantial atmosphere. A cold one, to be sure, but an atmosphere nonetheless. On its surface, Titan’s got frigid rivers and lakes of methane. Below the surface, there’s ice. And below that, water. Lots of it.
Titan is big too—40 percent the size of Earth, in fact.
There might be even more to Titan...