Rocket engineers at Stennis Space Center in Mississippi are slated to attempt a 500-sec. hot-fire test of the J-2X engine this week, running the Saturn-heritage upper-stage propulsion system through a full-duration burn for the first time. Formerly the pacing item in the development of the terminated Ares I crew launch vehicle, testing of the human-rated J-2X is being slowed to free funds for development of a throwaway version of the space shuttle main engine (SSME) that is also ...


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