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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Europa was first discovered by Galileo in 1610, making it one of the Galilean Satellites. It is Jupiter's 4th largest moon, 670,900 km ( miles) from Jupiter. Europa's diameter is about half the distance...more
The Galileo mission discovered an amazing thing! Europa has its own atmosphere, although it is very, very thin. When fast moving molecules traveling through space near Jupiter hit Europa's atmosphere,...more