Rob Carr writes: "According to the Cassini team, 'Recent images of Titan from NASA's Cassini spacecraft affirm the presence of lakes of liquid hydrocarbons by capturing changes in the lakes brought on by rainfall.' The northern lakes are now larger following a period where hydrocarbon clouds covered their skies. This change adds to the evidence these areas are indeed hydrocarbon lakes. But this discovery raises several more questions: where is the methane in the atmosphere coming from and, how long can this complex hydrocarbon cycle on Titan go on? The new evidence emphasizes the need for another mission to Titan."
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