On February 13 , 2008 , scientists said that Titans polar lakes contain `` hundreds of times more natural gas and other hydrocarbons than all the known natural gas on Earth . '' According to Cassini data , scientists announced on February 13 , 2008 , that Titan hosts within its polar lakes `` hundreds of times more natural gas and other liquid hydrocarbons than all the known oil and natural gas reserves on Earth . ''