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NASA's Swift satellite caught one of the first images of comet ISON on Jan. 30, 2013 with this 5.5-minute optical exposure. ISON was about 5,000 times fainter than the limit of human vision.
Credit: NASSA/Swift/D. Bodewits, UMCP
(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.