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Titan, Saturn’s largest moon, has been visited by a spacecraft, Cassini-Huygens. It appears to have a nitrogenous atmosphere with evaporated methane and ethane, oceans of methane and ethane, and a crust of water ice. It has features formed by wind and liquid erosion. Recently, slippage of the crust makes people think that there is liquid water below, as well. It’s altogether an interesting planet.