091209-F-6680C-640

091209-F-6680C-640

An X-51A Waverider successfully launched from a B-52 Stratofortress, like the one shown here, on May 26, 2010. It was the longest supersonic combustion ramjet-powered hypersonic flight to date and accelerated to Mach 6. (U.S. Air Force photo/Mike Cassidy)

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