A NASA research jet sets a new air speed record for air-breathing engines by traveling nearly 7,000 mph, or 10 times the speed of sound. The space agency's X-43A "scramjet" flew over the Pacific Ocean at 110,000 feet after being taken aloft under the wing of a B-52B bomber.
After its release from beneath the larger craft's wing, a booster rocket ignited, sending the X-43A on its way. NPR's David Kestenbaum reports.
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