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Moon craters reveal surprise rise in asteroid shrapnel pelting Earth

New Scientist January 17, 2019

“This work has some very interesting implications for the cause of this uptick in the cratering rate,” says Meenakshi Wadhwa at Arizona State University. It could indicate that one or more large asteroids in the asteroid belt broke up around that time, sending a rain of shrapnel towards the inner solar system, she says.