U.S. Developing Jets That Fly Five Times the Speed of Sound

Publication: National Geographic News   Date: March 14, 2007   View Article

The U.S. Air Force is preparing to test a new vehicle that could make missiles—and someday, jets—travel ten times faster than those flown today, military officials say.

The research vehicle, known as the X-51A, will be able reach hypersonic speeds when it is tested in 2009.

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