In July of 1994, Jupiter was hit by a succession of comet fragments. The comet, Shoemaker-Levy, broke into at least 21 fragments prior to its impact with Jupiter. As these fragments collided with the planet, they left clearly visible marks in Jupiter's atmosphere.
Here's a movie showing what it would be like to be riding a fragment of Comet Shoemaker-Levy as it crashed into Jupiter.
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The StarChild Team
StarChild Graphics & Music: Acknowledgments
StarChild Project Leader: Dr. Laura A. Whitlock
Responsible NASA Official: Phil Newman