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Wikipedia definition
1. Impact eventAn impact event is the collision of a large meteorite, asteroid, comet, or other celestial object with the Earth or another planet. Throughout recorded history, hundreds of minor impact events have been reported, with some occurrences causing deaths, injuries, property damage or other significant localised consequences. There have also been major impact events throughout Earth's history which severely disrupted the environment and caused mass extinctions.
Read “Impact event” on English Wikipedia
Read “隕石衝突” on Japanese Wikipedia
Read “Impact event” on DBpedia

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