From July 16 through July 22, 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter, with dramatic effect. This was the first collision of two solar system bodies ever to be observed. Shoemaker-Levy 9 consists of 20 discernable fragments with diameters estimated at up to 2 kilometers, which impacted the planet at 60 km/s. The impacts resulted in plumes many thousands of kilometers high, hot "bubbles" of gas in the atmosphere, and large dark "scars" on the atmosphere which have lifetimes at least on the order of weeks. Smaller bits and dust continue to impact the planet. Shoemaker-Levy 9 is gone, but as the Earth- and space-based images show, it did not go quietly.
Images of the Collisions
Hubble Space Telescope
Ulysses and Voyager 2
International Conference on Shoemaker-Levy 9