NASA wants a whole new crop of rocket engines from engine manufacturer Aerojet Rocketdyne. The space agency just awarded the company a $1.16 billion contract, restarting Aerojet's production line for its RS-25 engines. Four RS-25s will be used as the primary engines in NASA's next big rocket, the Space Launch System (SLS), which could take humans into deep space and on to Mars someday.
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