This is an image showing a linear string of craters on the surface of Jupiter's moon Callisto. Such a string of craters may have been formed when a broken comet such as SL-9 struck the surface.
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NASA/NSSDC and the Space Telescope Science Institute
The nice neat row of craters shown in this picture on the surface of Jupiter's moon Callisto is called a craterchain. It was probably made by a broken comet just like Comet Shoemaker-Levy 9. Craterchains found on moons such as this show that comets have hit planets and moons before.
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