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This is an image showing a linear string of craters which may have been created when a broken comet such as SL-9 struck the surface.
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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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The Comet Coma

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA