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Flying doorstop: The wedge shape of the X-43 compresses air entering the engine. This computational fluid dynamics image shows the vehicle's pressure gradients at Mach 7. (NASA Dryden)

Debrief: Hyper-X

Scramjet power? Simple: Keep a match lit in a 7,000-mph wind.

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About Michael Milstein

Michael Milstein is a freelance writer who specializes in science. He lives in Portland, Oregon.

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