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18 Jun Radioactive carbon-14 found in rings of Japanese cedar trees shows that Earth had a major influx of cosmic rays about 1,230 years ago, but researchers can find no obvious source for the increase. The most likely sources would have been either a major eruption on the surface of the sun or a nearby supernova, either of which could have showered the Earth’s atmosphere with highly energetic radiation, but historical records show no evidence of such an event. For the time being, its cause will have to remain a mystery, Japanese researchers reported Sunday in the online version of the journal Nature. (via Cosmic rays showered Earth 1,230 years ago, but where from?)

Radioactive carbon-14 found in rings of Japanese cedar trees shows that Earth had a major influx of cosmic rays about 1,230 years ago, but researchers can find no obvious source for the increase. The most likely sources would have been either a major eruption on the surface of the sun or a nearby supernova, either of which could have showered the Earth’s atmosphere with highly energetic radiation, but historical records show no evidence of such an event. For the time being, its cause will have to remain a mystery, Japanese researchers reported Sunday in the online version of the journal Nature. (via Cosmic rays showered Earth 1,230 years ago, but where from?)

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