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Simon Harrison

Vast cosmic event leaves record in ancient trees - space - 03 June 2012 - New Scientist - 0 views

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Dendrochronology

shared by Simon Harrison on 05 Jun 12 - No Cached
  • Simon Harrison on 05 Jun 12
     
    The wooden hearts of two cedar trees hold a 1200-year-old cosmic mystery - evidence of an unexplained event that rocked our planet in the 8th century. Cosmic rays are subatomic particles that tear through space. When they reach Earth they react with the oxygen and nitrogen in the atmosphere, producing new particles.
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