Engineers at NASA’s Stennis Space Center tested a modified RS-25 Space Shuttle Main Engine (SSME) for 450 sec. on May 28, marking the restart of hot-fire testing for the planned heavy-lift Space Launch System (SLS) after a five-month hiatus for test-stand modifications. The surplus shuttle engine test was the second with a new controller originally developed for the J-2X upper-stage engine that may someday power an advanced version of the SLS. Testing on the A-1 stand at Stennis was ...

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