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This image shows an artist’s depiction of a 10-kilometer (6-mile) diameter asteroid striking the Earth. Art by Don Davis This image shows an artist’s depiction of a 10-kilometer (6-mile) diameter asteroid striking the Earth. Approximately 70 of these dinosaur killer-sized or larger impacts hit the Earth over a span that lasted between 3.8 and 1.8 billion years ago. They are
Art by Don Davis