This is an image of the surface of Callisto.
Click on image for full size
NASA/NSSDC and the Space Telescope Science Institute
Linear tracks of craters, as shown in this image of the surface of Jupiter's moon Callisto show that a comet-like object such as comet Shoemaker-Levy 9 may also have struck that moon at one time in the past.
This is page 7 of 10