Methane occurs in the atmospheres of the gas giant planets and in the atmosphere and on the surface of Saturn's largest moon, Titan. It has also been detected in small quantities in the atmosphere of Mars (see methane on Mars).
Testing is underway of a methane rocket engine that might eventually be used on deep space missions.
Will-o'-the-wispAlso known as jack-o'-lantern, this is mysterious light sometimes seen at night in marshy areas. It is not well understood but is thought to be due to the spontaneous combustion of methane. Its elusive nature makes it the basis for various superstitious beliefs.
Related category• ORGANIC CHEMISTRY
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