Primary payload on STS-50 was the United States Microgravity Laboratory-1 (USML-1), a manned Spacelab module with connecting tunnel to the orbiter crew compartment. USML-1 was an American national effort to advance microgravity research in a broad number of disciplines. The 13-day mission, the first so-called extended duration orbiter flight and the then longest space shuttle mission, also provided new information on the effects of long-term human stay in space. Examples of experiments conducted were: Crystal Growth Furnace, Drop Physics Module, Zeolite Crystal Growth, Protein Crystal Growth, Glovebox Facility, Space Acceleration Measurement System.
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 USML Glovebox