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If you mean here on earth, yes - for one, the "Tunguska Event" in Siberia early in the 20th century is believed by many astronomers to have been caused by a chunk of Comet Encke breaking off and falling into earth's atmosphere. The "K-T Event", credited with the end of the dinosaur area may have been cause by a comet impact, though an asteroid is usually believed to have been the cause of that. The fact that water exists in huge quantities on the earth is also believed by many astronomers to have come from multiple comet impacts early in earth's history.

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