'Flammable' Titan covered in liquid gas: "Saturn's moon Titan is covered by 'dirty' ice ridges and seas of liquid natural gas, a team of scientists said on Friday after a week of research into data from the space probe Huygens."

"The methane can exist in liquid form on Titan's surface because it is so cold, -290 degrees Fahrenheit (-179 degrees Celsius). Methane is also a key component in Titan's atmosphere, along with nitrogen. But as opposed to the Earth, the atmosphere of Titan lacks oxygen, which is essential to fire.

"'There's no source of oxygen available, which is a good thing or Titan would have exploded a long time ago,' Owen said."