This is an image of Mimas.
Click on image for full size
NASA/JPL
The Surface of Mimas
The surface of Mimas is covered with craters. In that respect Mimas is very much like
Callisto.
The largest crater on the surface is what makes Mimas look like the Death Star. The crater is about as wide as Lake Michigan.
This crater is what remains of perhaps the largest collision that a small body such as Mimas could take without breaking in two.
Perhaps a collision like this is what caused a big moon to break and form Epimetheus and Janus.
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