The rocket-powered X-15 aircraft leaves a spectacular contrail as it begins its climb after launch from its modified B-52B mothership during a hypersonic research flight from NASA's Flight Research Center at Edwards, CA, in 1961.
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The rocket-powered X-15 aircraft leaves a spectacular contrail as it begins its climb after launch from its modified B-52B mothership during a hypersonic research flight from NASA’s Flight Research Center at Edwards, CA, in 1961.Date: 1961
Credit: National Geographic/NASA/Dean Conger
