Study shows how impact craters may form

Study shows how impact craters may form
http://dalje.com/en-world/study-shows-how-impact-craters-may-form/390016

Study shows how impact craters may form. Science News.
http://www.upi.com/Science_News/2011/10/20/Study-shows-how-impact-craters-may-form/UPI-26051319150854/#ixzz1cgD4itIS

Crater shapes, UPI
http://www.upi.com/story/image/fs/UPI-26051319150854/13191492262400/

F. Pacheco- Vazquez and J. C. Ruiz- Suarez, 2011, Impact 
craters in granular media: Grains against grains. Physical 
Reviews Letters. vol. 107, no. 218001, 5 pp
http://prl.aps.org/abstract/PRL/v107/i21/e218001

Happy Holidays,

Paul H.