Scientists studying tree rings found a sharp increase in the amount of radioactive carbon recorded in the rings of ancient Japanese cedar trees between and Carbon can be created by cosmic ray particles arriving from space, but what causes such cosmic ray increases? At first, experts were at a loss to explain the event, and the team that unearthed the tree ring data earlier this year dismissed the sun as a possible explanation. Now a new team of scientists argues that a solar flare is the most likely culprit. The sun could have released a huge and powerful blast of plasma into space called a coronal mass ejection , which, when it hit Earth, could have sparked the creation of carbon, suggest astrophysicists Adrian Melott of the University of Kansas and Brian Thomas of Washburn University, also in Kansas, in a paper published the Nov. Carbon is a variant of the normal form of carbon carbon that is common on Earth and throughout the universe.
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