Remember that mysterious cosmic event, hinted at in tree rings? Brief recap: Upon studying the tree rings in Japanese cedar trees, researchers found evidence for a sudden increase in 14C in the atmosphere. What, oh what, could have caused this? Supernova? Solar flare? Nope, said the authors. There’s no evidence for either. However, a new […]
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Between AD 774 and 775 something weird happened. And that something weird resulted in a 12% increase of 14C (a radioactive form of carbon) in the atmosphere. How do we even know this? Tree rings. Earlier work had enabled the dating of this phenomenon with the accuracy of a decade. Now, a new study improved […]
