Kansas: Did Supernovae Kill Off Large Ocean Animals at Dawn of Pleistocene?

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bystander
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Kansas: Did Supernovae Kill Off Large Ocean Animals at Dawn of Pleistocene?

Post by bystander » Sat Dec 15, 2018 8:42 pm

Researchers Consider Whether Supernovae Kill Off Large Ocean Animals at Dawn of Pleistocene?
University of Kansas, Lawrence | 2018 Dec 13
About 2.6 million years ago, an oddly bright light arrived in the prehistoric sky and lingered there for weeks or months. It was a supernova some 150 light-years away from Earth. Within a few hundred years, long after the strange light in the sky had dwindled, a tsunami of cosmic energy from that same shattering star explosion could have reached our planet and pummeled the atmosphere, touching off climate change and triggering mass extinctions of large ocean animals, including a shark species that was the size of a school bus. ...

“I’ve been doing research like this for about 15 years, and always in the past it’s been based on what we know generally about the universe -- that these supernovae should have affected Earth at some time or another,” said lead author Adrian Melott, professor emeritus of physics & astronomy at the University of Kansas. “This time, it’s different. We have evidence of nearby events at a specific time. We know about how far away they were, so we can actually compute how that would have affected the Earth and compare it to what we know about what happened at that time -- it’s much more specific.” ...

“As far back as the mid-1990s, people said, ‘Hey, look for iron-60. It’s a telltale because there’s no other way for it to get to Earth but from a supernova.’ Because iron-60 is radioactive, if it was formed with the Earth it would be long gone by now. So, it had to have been rained down on us. There’s some debate about whether there was only one supernova really nearby or a whole chain of them. I kind of favor a combo of the two -- a big chain with one that was unusually powerful and close. If you look at iron-60 residue, there’s a huge spike 2.6 million years ago, but there’s excess scattered clear back 10 million years.” ...

Muon Radiation Dose and Marine Megafaunal Extinction at the end-Pliocene Supernova ~ Adrian L. Melott et al viewtopic.php?t=35809
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Re: Kansas: Did Supernovae Kill Off Large Ocean Animals at Dawn of Pleistocene?

Post by neufer » Sat Dec 15, 2018 9:16 pm

Art Neuendorffer

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