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Medieval Earth hit by cosmic explosion

It is possible that the earth in the eighth century, was hit by a gamma-ray burst, the most powerful kind of explosion in the universe.

In 2012, researchers found evidence that our planet in the Middle Ages was hit by a blast of radiation.


In a new study claims that the explosion was the result of two merging black holes or neutron stars. When clashed enormous amounts of energy. The research is published in the journal Monthly Notices of the Royal Astronomical Society .

Solar Flame

Last year, Japanese researchers found in ancient cedar trees an unusually high concentration of radioactive carbon. In the ice of Antarctica was also found radioactive beryllium. The isotopes were formed when the radiation collided with atoms in the upper layer of the atmosphere. Based on the tree rings and ice cores, the team found that the eruption around the year 775 must have occurred.

They thought of a supernova, an exploding star, but that possibility was quickly ruled out because the remains of such an event can still be seen should be using telescopes.

A group of American scientists recently published a paper in which they indicate that the explosion could have been caused by an unusually large solar flare. Other scientists do not agree because they do not think that a solar flare may have been responsible for the detected concentration of radioactive carbon and beryllium.

Visible

German researchers are coming up with another explanation: a massive explosion that took place in the galaxy. Ralph Neuhauser of the University of Jena said that the measured values ​​may have been the result of a gamma-ray burst.

A collision of black holes, neutron stars and white dwarfs takes only a few seconds, but can be a huge wave radiation generated. The researchers estimate that the gamma explosion at a distance of 3,000 to 12,000 light years did.

Incidentally, our medieval ancestors probably experienced little of the event. The radiation was absorbed by our atmosphere and is only found in the isotopes in our trees and ice. The researchers do not think that the explosion had been visible.

Gamma-ray bursts are very rare and occur in the Milky Way at most once every 10,000 years.

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