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Titan is the only place besides Earth with a known liquid cycle
Saturn's largest moon, Titan, boasts a full hydrological system, but with one chilling twist: it is built on liquid methane and ethane rather than water. At surface temperatures of –179°C, methane evaporates into clouds, condenses into heavy rainfall, carves meandering river networks, and collects in sprawling polar seas like Kraken Mare. It is the only extraterrestrial world known to maintain standing liquid bodies on its surface.
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