NASA’s J-2X upper-stage engine ran through a 500-sec. hot-fire test Wednesday, achieving full duration for the terminated Ares I crew launch vehicle it was designed to power and passing a crucial hurdle for the heavy-lift Space Launch System (SLS) that will use it instead. “Based on a quick look, it performed exactly as we expected it to,” said Mike Kynard, SLS engines element manager at the NASA Marshall Space Flight Center, after the test at NASA’s Stennis Space Center in Mississippi. ...
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