2018-01-162018-01-161985http://hdl.handle.net/2152.3/4549The Spacelab 3 mission, STS 51-B, which focused on research in microgravity, took place during the period April 29 through May 6, 1985. Spacelab 3 was the second flight of the National Aeronautics and Space Administration’s modular Shuttle-borne research facility. STS 51-B was the seventeenth flight of NASA's Space Shuttle program, and the seventh flight of Space Shuttle Challenger. This image reflects William Thornton, Mission Specialist and a pupillary size study.pupillary sizeWilliam E. ThorntonSpacelab 3STS-51-BshuttleSpace Medicine