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Ackerman, Spencer. "There Is No Way to Stop Space Rocks From Hurtling to Earth and Killing
You." Wired.com. 13 Feb. 0013. Conde Nast Digital. 04 May 2013
< http://www.wired.com/dangerroom/2013/02/russia-meteor/>.
Harris, Wiliam. "10 Ways to Stop a Killer Asteroid." HowStuffWorks. 26 Mar. 2012.
04 May 2013 < http://science.howstuffworks.com/10-ways-to-stop-asteroid.htm>.
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Company. 06 May 2013 <http://www.barringercrater.com/about/>.
Mann, Adam. "Efforts to Protect Earth From Asteroids Are Under Way. But Will It Be
Enough?" Wired.com. 20 Feb. 0013. Conde Nast Digital. 04 May 2013
< http://www.wired.com/wiredscience/2013/02/asteroid-watching-mitigation/>.
Niland, Lauren. "The Tunguska event: A Siberian meteor mystery from 1908." The
Guardian. 06 Aug. 0037. Guardian News and Media. 06 May 2013
<http://www.guardian.co.uk/theguardian/from-the-archive-blog/2013/feb/08/tunguska-asteroid-comet-1908-siberia>.
"Overview." B612 Foundation. 25 May 2013 <http://b612foundation.org/sentinelmission/>.
Tyson, Neil D. "We Can Survive Killer Asteroids - But It Won’t Be Easy."
Wired.com. 31 Mar. 0012. Conde Nast Digital. 04 May 2013
<http://www.wired.com/wiredscience/2012/04/opinion-tyson-killer-asteroids/>.