You test your engines while you develop them, but once they are production ready, you don't need to test them that much. But keeping the lights on means doing maintenance of the stands, tanks, etc.
NASA/MSFC has a requirement for an Interim Cryogenic Propulsion Stage (ICPS) for the early Space Launch System (SLS) missions. The early flights of the SLS architecture will require the use of an ICPS ...
NASA's one of a kind ocean going barge Pegasus was upgrade from its role transporting External Fuel Tanks for the Space Shuttle program to the core booster stage of the SLS rocket when crews added an ...
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