Eddy Nightshine ping.
It's supposed to be a subscriber service, but the paper is available to read.
http://news.nationalgeographic.com/news/pf/15220271.html
When Comets Attack:
Solving the Mystery of the Biggest Natural Explosion in Modern History
popularmechanics | May 7, 2009 | Mark Anderson
Posted on 05/07/2009 8:47:49 AM PDT by JoeProBono
http://www.freerepublic.com/focus/chat/2246134/posts