This ultraviolet image taken from the Hubble Space Telescope shows Jupiter's atmosphere after many impacts by fragments of comet Shoemaker-Levy 9.
H is visible rising on the left side.
Proceeding to the right, other dark spots were caused by impacts of fragments Q1, R, D and G, and L, with L covering the largest area of any seen thus far. The spots are very dark in the ultraviolet because a large quantity of dust is being deposited high in Jupiter's stratosphere , and that dust absorbs sunlight. Scientists will be able to track winds in the stratosphere by watching the evolution of these features. Jupiter's moon, Io , is the dark spot just above the center of the planet.