Saturn’s orange moon Titan has hundreds of times more liquid
 hydrocarbons than all the known oil and natural gas reserves on Earth, according
 to new Cassini data. The hydrocarbons rain from the sky, collecting in
 vast deposits that form lakes and dunes.
More at:

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMCSUUHJCF_0.html