SUMMARY: During its recent Titan flyby, NASA's Cassini spacecraft discovered that the outer layer of the moon's thick atmosphere is filled with complex hydrocarbons. Titan is very cold, so scientists expected that these hydrocarbons would condense out of the atmosphere and rain down on the moon's surface. Instead, some process of interaction between Titan's atmosphere, sunlight, and Saturn's magnetic field are keeping them aloft and cycling them through the atmosphere.

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