Muons penetrate much further than X-rays, they do essentially zero damage, and they are provided for free by the cosmos.
Image credit: Science Source/Digital Globe.
Edited by Thure E. Cerling, University of Utah, Salt Lake City, UT, and approved November 20, 2019 (received for review June 22, 2019)
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- Published in issue January 21, 2020.
- Published first January 6, 2020.
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- ↵1To whom correspondence may be addressed. Email: rebeccapaynercp{at}gmail.com.
Author contributions: R.C.P. and J.F.K. designed research; R.C.P. performed research; R.C.P. contributed new reagents/analytic tools; R.C.P., D.B., and J.F.K. analyzed data; R.C.P. and J.F.K. wrote the paper; and D.B. assisted with conceptual work.
The authors declare no competing interest.
This article is a PNAS Direct Submission.
This article contains supporting information online at https://www.pnas.org/lookup/suppl/doi:10.1073/pnas.1910698117/-/DCSupplemental.
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Oxidized micrometeorites suggest either high pCO2 or low pN2 during the Neoarchean
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- Earth, Atmospheric, and Planetary Sciences
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