"Sometime between the spring of 774 A.D and the summer of 775, a cataclysmic event happened somewhere out in the cosmos -- and we felt it here, as a spike of radioactive carbon-14 and beryllium-10. The isotopes were taken up by growing Japanese cedar trees and there they remained."A Japanese team revealed the anomalous 20-times-normal concentrations last year in a Nature piece, A signature of cosmic-ray increase in ad 774–775 from tree rings in Japan...
A Galactic short gamma-ray burst as cause for the 14C peak in AD 774/5.
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