Methane
Methane is an odorless, colorless simple hydrocarbon with the chemical formula CH4. It is the major component of natural gas that can produce energy through combustion. It exists on many planets, including Earth.

The atmosphere of a class K planet, such as Theta VIII, consists of methane, nitrogen, and liquid neon. ()

The Axanar breathed a nitrogen-methane atmosphere. ()

In 2151, the Klingon courier Klaang led two Suliban pursuers into a grain silo on Earth, owned by a farmer named . The silo contained methane, which Klaang detonated behind him, killing the Suliban. ()

In 2364, an accidental explosion from a methane-like gas occurred on the colony on Quadra Sigma III. ()

The surface of the planet Alpha Onias III contained high, but non-toxic, levels of sulfur dioxide, methane, and hydrogen sulfide. ()

In 2370, the  inspected the vessel  via an interface probe controlled by Geordi La Forge. The probe entered a hull breach in the aft section of the Raman and detected atmospheric gases inside the corridor – primarily methane and ammonia. ()

There were traces of potassium nitrate, ammonium, and methane in the back of a truck the  found drifting in space in 2371. Kathryn Janeway identified it as horse manure. ()

In an alternate timeline where the Borg assimilated Earth after stopping Zefram Cochrane's warp flight, the planet had an atmosphere of methane, carbon monoxide, and fluorine in 2373. ()

A class 6 gas giant encountered by Voyager in 2375 had a layer of liquid hydrogen and methane ten thousand kilometers below the outer atmosphere. ()

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nl:Methaan
Chemical compounds