Methane
Titan

Methane has been detected in vast abundance on Titan, the largest moon of Saturn, it comprises a significant portion of its atmosphere and also exists in a liquid form on its surface, where it comprises the majority of the liquid in Titan's vast lakes of hydrocarbons; the second largest of which is believed to be almost pure methane in composition.

The presence of stable lakes of liquid methane on Titan, as well as the surface of Titan being highly chemically active and rich in organic compounds, has led scientists to consider the possibility of life existing within Titan's lakes, using methane as a solvent in the place of water for Earth-based life and using hydrogen in the atmosphere to derive energy with acetylene, in much the same way that Earth-based life uses glucose.
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