Megalodon may have been killed off by Supernova
radiation, Hannah Osborne, Newsweek, December 13, 2018
https://www.newsweek.com/megalodon-extinct-shark-supernova-cosmic-ray-cancer-mutations-1256980
Massive supernova explosion may have wiped out giant
prehistoric sharks, scientists say. Megalodon may have
been among creatures driven to extinction after cosmic
particles drove up cancer rates, new study claims
The Independent, Josh Gabbatiss, December 2018
https://www.independent.co.uk/news/science/supernova-stars-explosion-giant-sharks-prehistoric-megalodon-extinction-science-a8679636.html
The paper is:
Adrian L. Melott, Franciole Marinho, and Laura Paulucci
2018, Hypothesis: Muon Radiation Dose and Marine
Megafaunal Extinction at the End-Pliocene Supernova.
Astrobiology, Published Online, November 27, 2018
https://doi.org/10.1089/ast.2018.1902
and at
Muon Radiation Dose and Marine Megafaunal Extinction at the end-Pliocene Supernova
Adrian L. Melott (Kansas), Franciole Marinho, Laura Paulucci
(Submitted on 26 Dec 2017 (v1), last revised 17 Oct 2018 (this version, v2))
https://arxiv.org/pdf/1712.09367.pdf
https://arxiv.org/abs/1712.09367
Yours,
Paul H.