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Asteroid Rate Jumped in Solar System’s Past | Quanta Magazine January 21, 2019

Posted by sandyclaus in Uncategorized.
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Some 290 million years ago, as the last trilobites scuttled across the seafloor, the skies above grew just a little more ominous. At that point, large asteroids — including the impactor that would later kill off the dinosaurs — began to rain down on our planet between two and three times more frequently than they did before, according to a study published today in Science. Researchers spotted the trend while surveying impact craters on both Earth and our closest celestial neighbor, the moon. In these records, many impact craters date back to the past few hundred million years. Older ones are few. “It was surprising,” said Sara Mazrouei of the University of Toronto, the lead author of today’s paper. “We see the footprints of it, but what really happened to cause this?”

Source: Asteroid Rate Jumped in Solar System’s Past | Quanta Magazine

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