The Frequency of Asteroid Impacts Jumped Just Before the Dinosaur Age, New Research Suggests  

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By comparing the age of impact craters on the Moon to those on Earth, researchers say they have discovered a surge in the rate of asteroid strikes starting around 290 million years ago—a finding that runs contrary to scientific convention. And indeed, not everyone is convinced by the evidence.

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https://gizmodo.com/the-frequency-of-asteroid-impacts-increased-just-before-1831839017