Images from Cassini spacecraft gave astronomers a great deal of new information about the seas of Titan, a moon of Saturn. The study of Ligei Sea showed that it is mainly composed of liquid methane. The amount of methane in that sea is about 9,000 cubic meters, which is 40 times greater than all proven oil and gas reserves on Earth. The sea is about 160-170 meters deep. In addition to methane, it...