This is an image showing a string of craters which may have been created when a broken comet struck the surface.
Click on image for full size
NASA/NSSDC and the Space Telescope Science Institute
Craterchains
Observations such as these now suggest that moons of Jupiter have been struck in the past by strings of broken comet material such as that of comet
SL-9. The craterchain shown here is found on Jupiter's moon Callisto.
Other craterchains that have been found are:
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