The scientists said the planet may have been influenced by the strongest explosion known in the Universe - a gamma-ray burst - during the eighth century.
The researchers found in 2012 is evidence to suggest that our planet was wounded in a radioactive explosion during the Middle Ages, but still a cause controversy about what cosmic event which may have caused the explosion.
According to a recent study that probably resulted from two black holes or merger stars nitronic in our galaxy.
Such a blast to result in the launch of huge amounts of energy.
The study was published in the journal (monthly observations of the Royal Astronomical Society).
A snapshot of nature
Last year a team of scientists found some ancient cedar trees in Japan contain extraordinary levels of radiation carbon known as carbon-14.
In Antarctica, there was a sharp rise in the levels of substance beryllium-10 in ice.
These isotopes are made when they collide with intense radiation atoms in the upper atmosphere, which is likely that there is an explosion of energy hit our planet from space.
Scientists using tree rings and data from ice samples determine that occurred between 774 and 775 AD, but the cause of the incident is still a mystery.
The deployment of a team of physicists Americans finally search is likely to be a huge solar explosion exceptionally may cause the generation of this burst of energy. But others in the scientific community objected to this, because they do not believe that the energy generated consistent with the levels of carbon -14 and beryllium -10.
The other team of German researchers another explanation to the effect that a huge explosion occurred in the Milky Way.
And Ralph Njohauser said, one of the supervisors on research at the Institute for Space Physics at the University of Jena "looking shades of short blasts of gamma-ray in order to determine whether it is in conformity with the rate of production of carbon -14 and beryllium-10 that we observed, and we reached it completely identical."
The Njohauser added that "Gamma-ray bursts are highly explosive incidents and full of energy, so energy Astenbtna What is the distance, taking into account the observed energy."
"It was our conclusion is that it is at a distance of between 3,000 to 12,000 light-years away, which fall within the scope of our galaxy."
And despite the fact that the event might have seemed exciting, the ancestors in the Middle Ages did not anything to look.
If gamma-ray burst has occurred on this distance, it is our atmosphere would have been absorbed radiation due to leave only isotope effects on the body made its way eventually to the trees and ice. Scientists believe that the event did not lead to the emission of any visible light.
Rare events
Suggest deep space observation that gamma-ray bursts is rare. There is a belief that they occur at most every 10 thousand years each galaxy, and at least every million in each galaxy.
The Njohauser said he is not likely to see the planet another explosion soon, but if that happens, this time will have a significant impact.
If the recurrence of a cosmic explosion at the same distance as in the eighth century will hit our satellites.
Commenting on the research, said Adrian Milot professor at the University of Kansas America said that although he believed that an explosion a short gamma is the conclusion of the question, the research conducted by his team suggests that the most likely cause might be an explosion solar, depending on the views Anjum like the sun in our galaxy .
He added Milot that "event for Proton sun or splash gamma are two explanations possible routes, but based on the amount of available we know about the universe, the interpretation of explosion splash of gamma rays are less likely about 10 thousand times to be real in that period."
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