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Gamma-Ray Burst Fingered For 774 A.D. C-14 Spike

21 Jan 2013, 23:27 UTC
Gamma-Ray Burst Fingered For 774 A.D. C-14 Spike
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The year is 774 A.D. A blast of energy from outer space hits Earth. No one alive then seems to have been aware of it. But the event was recorded--in the trees. Last year researchers announced that tree-ring data from 774 and 775 show a sudden spike in radioactive carbon 14. The uptick points to a burst of charged particles or high-energy radiation that struck Earth. But what caused it? [More]

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