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| physical phenomena > event > celestial event > impact event > comet impact | 
| comet impact comparison table | ||||
| Subject | is an instance of | is a kind of | has duration | has start time | 
|---|---|---|---|---|
| Shoemaker-Levy 9 collision | comet impact | 7 days | July 16, 1994 | |
| Tunguska meteorite | comet impact | 
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