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We found 2 dictionaries that define the word Comet ISON:

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  1. Comet ISON, Comet Ison, Comet ISON: Wikipedia, the Free Encyclopedia

Definitions from Wikipedia (Comet ISON)

noun:  Comet ISON, formally known as C/2012 S1, was a sungrazing comet from the Oort cloud which was discovered on 21 September 2012 by Vitaly Nevsky (Віталь Неўскі, Vitebsk, Belarus) and Artyom Novichonok (Артём Новичонок, Kondopoga, Russia).


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