Titan is the largest moon of Saturn and is the second largest satellite in our Solar system, with a diameter of 5150 kilometers. Titan's thick nitrogen and methane atmosphere clearly indicates that it is fundamentally different. In fact it's the only moon in our solar system with a thick atmosphere. In fact the atmospheric pressure at the surface of Titan is roughly 1.5 times as high as that on the Earth. Some have proposed that a methane or ethane rain falls from the skies of Titan, possibly forming oceans and/or lakes.

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