Text clue to ancient radiation spike
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
- Earth Is In The Early Days Of A New Mass-Extinction Event, Researchers Warn
- Without World War I, what would literature look like today?
- The Secret to Early Jewish Success: Literacy
- Egypt’s Nasser is blamed for current problems by the regime
- ‘Google must not be left to censor history’ – Wikipedia founder
- Yale's Jay Winter sums up what we should remember about WW I
- Plagiarism scandals galore … but no consequences?
- Historian who calls bull&%$@ on July 4th parade causes controversy
- This is what motivated history students in high school and middle school can do!