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June 5, 2012

Study reveals a cosmic ray bombardment against the Earth more than 1,200 years

The Earth was hit by a wave of powerful and mysterious radiation from outer space more than 1,200 years ago, reported the journal Nature.Those strange cosmic events, examined by experts from Japan, occurred in the eighth century.

According to the magazine, right between the years 774 and 775 AD space in our neighborhood, something happened that triggered a barrage of cosmic rays hitting the Earth with an intensity never seen before.A team of specialists from the University of Nagoya Nippon, led by Fusa Miyake, were found traces of that event in the tree rings and marine deposits worldwide.

Analyzing this phenomenon for years, Miyake and his team used data from carbon 14 (a radioactive isotope of carbon) and scored more than interesting.Measuring the index of that element of two old cedars in Japan, scientists realized that the rings for the years 774 and 775 had an increase of 1.2% carbon 14 relative to other years. (Keep in mind that the typical annual variation of carbon-14 is just 0.05%, this percentage increases as the standard 20 times).

The work of Miyake group aims to analyze two hypotheses for this phenomenon discovered. The first talk of a possible source of cosmic rays may have been caused by a powerful explosion on the Sun's surface is true that solar activity varies over periods of 11 years and sometimes surprises us with intense flares whose effects reach Earth.Under the second scenario, an event so powerful is due to the violent death of a star: the explosion of a supernova.

"This is very strange cosmic event. Yes we can say that an extremely energetic event happened in our space environment around the year 775, but the cause was a solar flare or a supernova, "said Japanese researcher.To complement and develop the studies, researchers at the University of Nagoya documented evidence are missing. However, no data on a solar flare of this intensity.

The other possibility has not been proven, because so far no documents were found, 774 or 775 to reflect an event, the brightness of a supernova, which should attract the attention of the inhabitants of Earth.Thus, the origin of most cosmic ray bombardment which the news is still a mystery.

"With our current knowledge we can not specify the cause of that event," acknowledged Miyake. To get to the origin of the phenomenon, Miyake and his team have to continue working.

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