Titan the sixth moon of Saturn is the largest moon. It has a dense orangy atmosphere which is due to organonitrogen (the organic compound that contains nitrogen). The size is 1 1/2 times bigger than the moon.
It is mostly made up of rocks and water ice. There are liquid hydrocarbon lakes in the polar region. The surface is generally smooth except for a few craters and a possiblity of cryovolcano (ice volcano: when erupt it spew out liquids like methane, water and ammonia instead of molten rock)
The climate has wind and rain which is similar to earth's climate except much colder 94 K (−179.2 °C) which creates seas, lakes, rivers and dunes. (Credit:en.wikipedia.org/wiki/Titan)