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The X-15 launches at 45,000 feet, already moving at 500 mph or better, in this photo from 1959. The X-plane typically was propelled by its rocket engine for about 1 to 2 minutes, then flew for 8 to 12 minutes without power before coming to Earth in a 200-mph glide landing.
April 15, 2012 4:00 AM PDT
Photo by: NASA
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