Explanation: It’s been raining on Titan . In fact, it’s likely been raining methane on Titan and that’s not an April Fools’ joke . The almost familiar scene depicted in this artist’s vision of the surface of Saturn’s largest moon looks across an eroding landscape into a stormy sky. That scenario is consistent with seasonal rain storms  temporarily darkening Titan’s surface  along the moon’s equatorial regions, as seen by instruments onboard the Cassini spacecraft . Of course on frigid Titan , with surface temperatures of about -290 degrees F (-180 degrees C), the cycle of evaporation, cloud formation, and rain involves liquid methane  instead of water. Lightning could  also be possible in Titan’s thick, nitrogen-rich atmosphere .
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