Melott, A. L., I. G. Usoskin, G. A. Kovaltsov, and C. M. Laird, 2015, Has the Earth been exposed to numerous supernovae within the last 300 kyr? International Journal of Astrobiology. 14(3):375–378 doi:10.1017/S1473550414000512
"ABSTRACT: We show that Firestone (2014) contains numerous errors in the application of past research. F14 overestimates likely nitrate and 14C production from moderately nearby supernovae by about four orders of magnitude. Moreover, the results are based on wrongly selected (obsolete) nitrate and 14C datasets. The use of correct and up-to- date datasets does not confirm the claimed results. The claims in the paper are invalidated." PDF file at http://cc.oulu.fi/~usoskin/personal/Melott_2015.pdf and http://arxiv.org/abs/1406.5141 . Also, there is "Comment on: “Observation of 23 Supernovae that exploded <300 pc from Earth during the past 300 kyr” by R.B. Firestone" arXiv.org > astro-ph > arXiv:1406.5141v1 Astrophysics > Earth and Planetary Astrophysics at: http://arxiv.org/abs/1406.5141v1 , http://arxiv.org/find/astro-ph/1/au:+Melott_A/0/1/0/all/0/1 , and http://fermilab.voxcharta.org/2014/06/19/comment-on-observation-of-23-supernovae-that-exploded-300-pc-from-earth-during-the-past-300-kyr-by-r-b-firestone/ Yours, Paul H. ______________________________________________ Visit our Facebook page https://www.facebook.com/meteoritecentral and the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] https://pairlist3.pair.net/mailman/listinfo/meteorite-list
