Last week the Navy took its best shot and it was a doozy. The shot, fired on December 10th, broke the world record for the most powerful shot, as the 23-pound aluminum projectile rocketed out of the Navy's electromagnetic railgun at a reported speed of Mach 7, or seven times the speed of sound.
by Jennifer Welsh
http://blogs.discovermagazine.com/80beats/2010/12/13/navys-new-railgun-shoots-at-mach-7-can-hit-targets-100-miles-away/
JW
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