Methane rain

One week after landing, Huygens now sits idle on Titan’s frigid –170C surface, and it’s last hours it gave scientists enough data to analyze for years to come. When it landed, it warmed the landing site a little and kicked up methane gas, suggesting that the ground contains a lot of liquid methane (liquid natural gas) that has recently fallen from Titan’s cloudy skies. The terrain on Titan’s surface is a lot like Earth’s: shaped by the precipitation and erosion of rain. Except on Titan, the rain is liquid methane. Methane rain, flowing into methane channels, into methane rivers, into lakebeds dotted with islands. The dry soil appears to be loose and sandy, made from water ice that is blackened by the organic molecules called hydrocarbons that fall out of the mist. This black soil is washed down from the higher elevations and fills the rivers and lakes. There is also evidence that Titan has cold volcanoes that generate frozen water ice and ammonia. Link.