This is an image of Proteus, a moon of Neptune.
Click on image for full size
Evolution of Small Moons
The small moons are too small to be seen, so it is hard to say anything about what they are made of, or what their history might be.
Some of the small moons may be little pieces of another, bigger, moon which broke apart. Or they may be captured asteroids. Examples of moons such as these are Epimetheus, Janus, and Hyperion.
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