SUMMARY: A supernova that exploded 41,000 years ago might have led to the extinction of mammoths, according to researchers at Berkeley Lab. They found ancient mammoth bones peppered with iron-rich grains that had been traveling at 10,000 km/second. These grains might have been emitted from a supernova that exploded about 250 light-years away from Earth. It's also possible that debris from the supernova coalesced into comet-like objects; one could have struck the earth about 13,000 years ago.
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