Saturn's moon Titan has a 'sea level' like Earth: NASA study
Titan, the only other body in the Solar System with stable liquid on its surface, has seas filled with liquid hydrocarbons like methane, which lie at an average elevation like the "sea level" on Earth, according to NASA. The study was based on data from NASA's $3.9-billion Cassini spacecraft that was crashed into Saturn in 2017 after a 20-year mission.