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Comet Shoemaker-Levy 9

Comet Shoemaker-Levy 9 (SL9, formally designated D/1993 F2) was a comet which collided with Jupiter in 1994, providing the first direct observation of the collision of two solar system objects.

Note:   The above text is excerpted from the Wikipedia article "Comet Shoemaker-Levy 9", which has been released under the GNU Free Documentation License.
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