Aerojet Rocketdyne has finished testing the J-2X rocket engine for NASA. But the company probably will have to put the Apollo-heritage upper stage propulsion back on the shelf, as the upper stage for the heavy-lift Space Launch System (SLS) NASA is building probably will not be able to use it. Once considered the pacing item in returning to human space launch from U.S. soil after the space shuttle fleet was retired, the Apollo-heritage J-2X is too powerful, and probably too heavy, for the ...


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