Astronaut James D. van Hoften tests the manned maneuvering unit (MMU) in the cargo bay of the space shuttle Challenger as a part of an extravehicular activity (EVA) during Flight 41-C. The Solar Maximum Mission Satellite (SMMS), repaired and ready for release into space, is docked at the flight support system (FSS) at the rear. DF-SC-84-10566

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