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NASA also reported that almost all water present in Jupiter's stratosphere, an intermediate atmospheric layer, originated from comet Shoemaker-Levy 9, which gave quite a show in 1994 when it impacted Jupiter's atmosphere.
On July 24, 1994, the Hubble Space Telescope caught comet Shoemaker-Levy when it broke up and crashed into Jupiter. This could possibly happen to Comet ISON when it approaches the Sun. There are eight different impact sights in this image.