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Giant gun fires simulated space junk

Engineers at the University of Dayton Research Institute prepare to fire the world's only three stage light-gas gun.
June 27, 2007

Engineers in Dayton have developed a 45 foot long gun that uses compressed hydrogen and a pound of gunpowder to shoot aluminum pellets into a vacuum at 20 thousand miles per hour. It’s taken them nine years of gradual progress and patience to get this one-of-a-kind gun working.