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Scientific American

October 1, 1990

1 min read

An Extraterrestrial Impact

Accumulating evidence suggests an asteroid or comet caused the Cretaceous extinction

By Frank Asaro & Walter Alvarez

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This article was originally published with the title “An Extraterrestrial Impact” in Scientific American Magazine Vol. 263 No. 4 (October 1990), p. 78
doi:10.1038/scientificamerican1090-78

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