All you need to know about Saturn’s moon Titan Saturn’s moon Titan is not only the 2nd largest moon in the solar system, but also it is bigger than Mercury planet. Like Earth, Titan also has liquid that flows in rivers and lakes on the surface. However, these rivers and lakes don’t contain water. They hold hydrocarbons such as methane. Titan contains ocean of water but not on the surface. It flows under Titan’s frozen surface. Its atmosphere is rich in nitrogen just like Earth. [The image is taken from npr.org] #Space