http://www.nature.com/news/mysterious-radiation-burst-recorded-in-tree-rings-1.10768
"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." http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11123.html Is it possible that our sun generated an unprecedented energy burst? T
