Mysterious radiation burst recorded in tree rings (supernovae and solar flares ruled out)
Just over 1,200 years ago, the planet was hit by an extremely intense burst of high-energy radiation of unknown cause, scientists studying tree-ring data have found.
The radiation burst, which seems to have hit between ad 774 and ad 775, was detected by looking at the amounts of the radioactive isotope carbon-14 in tree rings that formed during the ad 775 growing season in the Northern Hemisphere.
Very interesting. I’ll have to contemplate that.
(Source: nature.com, via bethyhealer)