Titan is Saturn's largest moon. It is an icy world whose surface is completely obscured by a golden hazy atmosphere. Titan is the second largest moon in our Solar System. Only Jupiter's moon Ganymede is larger, by just 2%. Titan is bigger than Earth's moon, and even larger than Mercury.

Titan is the only moon in the Solar System with a dense atmosphere. It is the sole other place in our Solar System known to have an earthlike water cycle. In other word, on Titan liquids rain from clouds, flow across its surface, fill lakes and seas, and evaporate back into the sky.