Describe how Saturn’s moon Titan differs from Jupiter’s Galilean moons.

Titan is the only satellite in the solar system to have an atmosphere composed primarily of nitrogen. There are lakes of liquid hydrocarbons on Titan, there seems to be a methane cycle, as on Earth there is a water cycle. Io has active volcanoes, and the surface is changing very quickly. Europa, Ganymede, Callisto are covered with a thick layer of water ice.

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