Japanese scientist Fusa Miyake unearthed evidence last year of a mysterious wave of radiation that blasted the Earth in 774 or 775 AD.
Carbon–14, an isotope that is typically associated with high-energy radiation, was discovered in the rings of ancient cedar trees. One cause for the prevalence of this isotope is theorized by two German scientists, Valeri Hambaryan and Ralph Neuhaeuser, who suggest that two black holes collided around 774 AD and sent a gamma ray burst that bathed the Earth in radiation.
The scientists also posit that a collision of neutron stars or white dwarf stars may have also caused the radiation surge.
There is no evidence, however, that a supernova occurred at that time; yet, coincidentally, an Anglo–Saxon chronicle details the appearance of a red crucifix in the sky after sunset in 776 AD.
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The gamma ray burst likely occurred 3,000 light years away, otherwise the Earth would have been sterilized. Scientists think it is important to establish how often such spikes in the level of carbon–14 occur because if such an event were to happen today, many of the systems upon which modern technology depends would be damaged.
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