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Earth May Have Been Hit by a Cosmic Blast 1200 Years Ago by +Philip Plait

Well now, here’s something I never thought I’d hear: The Earth may have been hit by a gamma-ray burst, a violent cosmic blast of energy, about 1200 years ago!

First off, this is nothing to panic about. If it happened at all, it was a long time ago, and unlikely to happen again for hundreds of thousands of years. And if it did happen, it didn’t cause any mass extinctions or anything like that—if it had, we’d have known about it earlier!
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