Text clue to ancient radiation spikeBreaking News
An eerie "red crucifix" seen in Britain's evening sky in ad 774 may be a previously unrecognized supernova explosion — and could explain a mysterious spike in carbon-14 levels in that year's growth rings in Japanese cedar trees. The link is suggested today in a Nature Correspondence by a US undergraduate student with a broad interdisciplinary background and a curious mind1.
A few weeks ago, Jonathon Allen, a biochemistry major at the University of California, Santa Cruz, was listening to the Nature podcast when he heard about a team of researchers in Japan who had found an odd spike in carbon-14 levels in tree rings. The spike probably came from a burst of high-energy radiation striking the upper atmosphere, increasing the rate at which carbon-14 is formed (see 'Mysterious radiation burst recorded in tree rings').
But there was a problem: the only known causes of such radiation are supernova explosions or gigantic solar flares, and the researchers knew of no such events in ad 774 or 775, the dates indicated by the tree rings....
comments powered by Disqus
- Snopes debunks slavery Internet meme
- Revamped Chinese History Journal Welcomes Hard-Line Writers
- Poll: 3 Out of 5 Texan Trump Supporters Want Secession if Hillary Clinton Is Elected
- The Psychiatric Question: Is It Fair to Analyze Donald Trump From Afar?
- Minorities still feel Eugene, Oregon’s historical link to the Ku Klux Klan
- Ernst Nolte, Historian Whose Views on Hitler Caused an Uproar, Dies at 93
- Japan should give formal apology for wartime aggression, says historian
- Kevin Baker says America needs to bring back political machines
- Covell Meyskens uses his blog to show what life was like under Mao. (Interview)