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  • Title: Mass extinctions caused by large bolide impacts.
    Author: Alvarez LW.
    Journal: Phys Today; 1987 Jul; 40(7):24-33. PubMed ID: 11542219.
    Abstract:
    Evidence indicates that the collisions of Earth and a large piece of Solar System debris such as a meteoroid, asteroid or comet caused the great extinctions of 65 million years ago, leading to the transition from the age of the dinosaurs to the age of the mammals.
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