Saturn"s moon Titan has lakes containing methane, it rains methane and it"s water is as hard as rock. So what is the difference between water and methane?Watch the short video clip about Titan"s atmosphere. (40s)on the Extra-terrestrial life on Titan worksheet...…Gas……………………….……In a gas the bonds holding the molecules together are weaker, so it takes less heat energy to evaporate them.