The largest fragments from the Shoemaker-Levy 9 comet were about
2 kilometers across.
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In 1994, comet Shoemaker-Levy collided with Jupiter. Much of the
comet broke up in the atmosphere. The comet left visible scars on
Jupiter for many months.
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It was the ninth comet co-discovered by Eugene and Carolynn
Shoemaker and David Levy.