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Dec 1, 2015, 8:58 am168 pts
Ars Technica
Four reusable RS-25 engines will power NASA's SLS rocket as it ascends into space, and then they'll be discarded. (credit: NASA) On the Monday before Thanksgiving NASA made what it deemed a momentous announcement: the space agency had awarded $1.16 billion to Aerojet Rocketdyne for rocket engines that would…
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