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PostPosted: Fri Dec 14, 2018 1:35 pm 
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Location: Lancashire
Cosmic rays can be lethal to living organisms. A new theory to explain the disappearance of megafauna towards the end of the Pliocene has been proposed that may implicate a cosmic ray storm.
The megafauna at that time included the giant ground sloth and the huge, saw-toothed, megalodon shark.
A team of researchers led by Adrian Mellot at the University of Kansas has proposed that the enigmatic disappearance of megafauna could be explained by a supernova event, bathing the Earth with muons, causing large marine animals to develop cancers.
"There hasn't really been any good explanation for the marine megafaunal extinction," said Dr. Mellot. "This could be one." A hint to bolster the theory is the detection of the radioactive isotope Iron-60 in the seabed. The isotope is still radioactive, which would not be the case if it had been produced when the Earth was created, as it would have decayed.

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