Comet Shoemaker-Levy impact on Jupiter, July 1994. Last in a series of five frames from a computer simulation, showing the effect of the impact of a 1-km diameter comet on the atmosphere of Jupiter. The altitude scale in the model is exaggerated, giving the atmosphere a 'lumpy' appearance. This frame shows Day 4, three days after the impact. Large waves are seen in the atmosphere, moving from the point of impact (lower centre) and disrupting the 'bands'. Over 20 1-km or larger fragments from Comet Shoemaker-Levy 9 are due to hit Jupiter on 18-24 July 1994. The comet was broken up by Jupiter's gravity during a close encounter in July 1992.