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
- Kissinger Memo from 1972: Make the North Vietnamese think Nixon and I are crazy
- How Much U.S. History Do Americans Actually Know? Less Than You Think.
- Ice cream cone named after Adolf Hitler on sale in India sparks anger in Germany
- Expressing Outrage over Attacks on Cultural Heritage of Iraq, General Assembly Unanimously Adopts Resolution Calling for Urgent Action
- Isis Palmyra demolition has begun with ancient God Lion statue destroyed
- NYT hosts debate including Eric Foner: How Americans should remember Reconstruction
- William Leuchtenburg says historians and the media have been too hard on Obama
- Hugh Ambrose, historian who helped develop WWII Museum, dead at 48
- Historian discounts claim that Churchill and other British PM's were gay
- Nick Bunker Wins $50,000 2015 George Washington Book Prize