This is a composite image of the small moons of Saturn.
Click on image for full size
NASA
The Environment of Moons
The environment of the moons, with the exception of
Io, and
Titan, is one of little or no atmosphere, which means there is nothing to even out the warming of the surface by the sun. It is either burning hot, or freezing cold. It also means there is no pressure, which most terrestrial life forms require to hold their bodies intact (recall the movie Total Recall). Without an atmosphere, the lunar surfaces are also exposed to extreme ultraviolet light and energetic charged particles. These materials have a tendency to break down biological cells in life as we know it.
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