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(Image: NASA, ESA, J.-Y. Li (Planetary Science Institute), and the Hubble Comet ISON Imaging Science Team)
Here's the route of Comet ISON.
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.