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Comet showers as a cause of mass extinctions

Abstract

If at least some mass extinctions are caused by impacts, why do they extend over intervals of one to three million years and have a partly stepwise character? The solution may be provided by multiple cometary impacts. Astronomical, geological and palaeontological evidence is consistent with a causal connection between comet showers, clusters of impact events and stepwise mass extinctions, but it is too early to tell how pervasive this relationship may be.

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Hut, P., Alvarez, W., Elder, W. et al. Comet showers as a cause of mass extinctions. Nature 329, 118–126 (1987). https://doi.org/10.1038/329118a0

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