Younger Dryas impact model confuses comet facts, defies airburst physics

November 5, 2013
110 (45) E4170
Letter
Reply to Boslough et al.: Decades of comet research counter their claims
William M. Napier, Ted E. Bunch [...] Allen West
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Acknowledgments

Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL85000 (to M.B.).

References

1
JH Wittke, et al., Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago. Proc Natl Acad Sci USA 110, E2088–E2097 (2013).
2
RB Firestone, et al., Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling. Proc Natl Acad Sci USA 104, 16016–16021 (2007).
3
Boslough M, et al. (2012) Arguments and evidence against a Younger Dryas impact event. Climates, Past Landscapes, and Civilizations, Geophysical Monograph Series, eds Giosan L, et al. (American Geophysical Union, Washington, DC), Vol 198, pp 13–26.
4
WF Bottke, et al., Can tidal disruption of asteroids make crater chains on the Earth and Moon? Icarus 126, 470–474 (1997).
5
Z Sekanina, Earth’s 2006 encounter with comet 73P/Schwassmann-Wachmann: Products of nucleus fragmentation seen in closeup. Near Earth Objects, Our Celestial Neighbors: Opportunity and Risk. Proceedings of IAU Symposium No. 236, eds A Milani, GB Valsecchi, D Vokrouhlický (Cambridge Univ Press, Cambridge, UK), pp. 211–220 (2007).

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Published in

Go to Proceedings of the National Academy of Sciences
Go to Proceedings of the National Academy of Sciences
Proceedings of the National Academy of Sciences
Vol. 110 | No. 45
November 5, 2013
PubMed: 24170865

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Published online: November 5, 2013
Published in issue: November 5, 2013

Acknowledgments

Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL85000 (to M.B.).

Authors

Affiliations

Mark Boslough1 [email protected]
Sandia National Laboratories, Albuquerque, NM 87185;
Alan W. Harris
MoreData!, La Cañada, CA 91011;
Clark Chapman
Southwest Research Institute, Boulder, CO 80302; and
David Morrison
SETI Institute, Mountain View, CA 94043

Notes

1
To whom correspondence should be addressed. E-mail: [email protected].
Author contributions: M.B., A.W.H., C.C., and D.M. performed research and wrote the paper.

Competing Interests

The authors declare no conflict of interest.

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    Younger Dryas impact model confuses comet facts, defies airburst physics
    Proceedings of the National Academy of Sciences
    • Vol. 110
    • No. 45
    • pp. 18025-18339

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