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Popular Mechanics May 7, 2009 Mark Anderson	When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History Scientists today think a small fragment of a comet or asteroid caused the "Tunguska event," so named for the Tunguska river in Siberia.
Geotimes January 2004 Richard P. Binzel	Asteroid Futures The efforts to locate large asteroids that might impact Earth, and what could be done if a threat was found.