What Happened to Earth’s Ancient Craters?

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Meteor Crater near Winslow, Ariz., one of just 190 confirmed craters on Earth.CreditCreditDaniel Slim/Agence France-Presse — Getty Images

The pace of space rocks pummeling Earth and the moon was relatively infrequent, but then doubled or tripled for unknown reasons, a new study finds. Read more…

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