Supernova explosions may have helped shape Earth's climate history

The article wraps up with "The results are not conclusive, given the various uncertainties involved. For example, it's difficult to date supernovas precisely; the inferred timing of the Vela explosion may be off by as much as 1,500 years, Brakenridge said. But he thinks that the new results, which were published online last week in the International Journal of Astrobiology, show that more research into a supernova-radiocarbon link is warranted.

“What keeps me going is when I look at the terrestrial record and I say, 'My God, the predicted and modeled effects do appear to be there," Brakenridge said.

He's not the only scientist to suggest that supernovas may have significantly affected life on Earth. Other studies have postulated that nearby star explosions have caused or contributed to some mass extinctions, by altering our planet's atmosphere and causing climatic shifts."

My observation. The c-14 dating method may or may not be impacted by supernovae too.
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I'm curious about the basic science to bump carbon up by two neutrons. So is it that supernovae have the better neutron energies more suitable for capture than ones from the Sun? What sort of flux density would Earth get from 4900 lyrs, or even the 815 lyr Vela SN? Are they great enough to make a 3% uptick from C12 to C14? Perhaps.

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