City-sized asteroids smacked ancient Earth 10 times more often than thought

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Asteroids the size of cities, like the one that wiped out the dinosaurs, slammed into the ancient Earth way more often than previously thought, a new study has found.

Approximately every 15 million years, our evolving planet would get a hit by a piece of rock about the size of a city, or even a bigger province, scientists with the new study said in a statement. The research was presented at the Goldschmidt geochemistry conference this month.

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