Titan has methane rivers and lakes, not water

Saturn's largest moon, Titan, has rivers, rainfall, and lakes, but they are composed entirely of liquid methane, not water. This moon, located 1.4 billion kilometers from the Sun, experiences a hydrological cycle similar to Earth's, but with methane as the working fluid. The lakes at Titan's north pole contain more combustible fuel than all proven oil and gas reserves on Earth combined. The mountains on Titan are made of water ice that is frozen so hard it behaves like rock. Titan is so large that it outsize the planet Mercury, making it the second-biggest moon in the solar system after Jupiter's Ganymede. The giant dunes on Titan are not made of sand like Earth's, but of organic compounds. This unique environment raises questions about how such a distant moon can have active geological processes. Scientists continue to study Titan to understand its methane cycle and the implications for planetary science.