NASA engineers have an ambitious test series planned this summer for the first complete J-2X upper-stage engine, even though it remains uncertain whether it will find a place in the agency's new heavy-lift Space Launch System (SLS). On June 11 workers installed the engine in historic Test Stand A2 at Stennis Space Center, Miss., originally built for Saturn V development and later used to test the space shuttle main engine. The first hot-fire test could come as early as this week, according ...


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