Astronauts Kathryn D. Sullivan, center left, and David C. Leestma, both 41-G mission specialists, perform an in-space simulation of refueling another spacecraft in orbit. Their station on the space shuttle Challenger is the orbital refueling system (ORS), positioned on the mission peculiar support structure (MPR ESS). The Large Format Camera (LFC) is left of the two mission specialists. In the left foreground is the antenna for the shuttle imaging radar (SIR-B) system onboard.

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Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
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Keywords: 1984, 20th, astronaut, astronauts, astronomy, astrophysics, century, challenger, david, eva, exploration, female, gravity, history, kathryn, leestma, male, man, microgravity, nasa, orbit, outer, person, science, shuttle, space, spacewalk, sullivan, woman