NASA’s unmanned X-43A "scramjet" broke the aircraft speed record for the second time this year yesterday, streaking flawlessly across clear blue Pacific skies at nearly 10 times the speed of sound to reaffirm the dream of "hypersonic" flight.

"What I can say is it looked really, really good," Randall T. Voland, senior research leader for the mission, said in a television news conference after the flight.

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