Five fun facts about Titan . . .
1. It's the only Solar System moon with a substantial atmosphere.
2. Except for Earth, Titan is the only Solar System body with an atmosphere that's primarily nitrogen.
3. It rains on Titan - but the rain is liquid methane, not liquid water.
4. Rocks on Titan are made of frozen water - it's so cold that ice is as hard as rock.
5. There are surface lakes on Titan - made of liquid methane.
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Saturn's planet-sized moon.