Real Upper-stage Ares I-Y Engine Mulled

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By Guy Norris

Fresh from the success of its Ares I-X development flight-test launch Oct. 28, NASA is putting renewed efforts into studies of whether or not to incorporate a real Pratt & Whitney Rocketdyne (PWR) J-2X engine in the upper stage of the follow-on Ares I-Y suborbital test....

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