During her time in orbit around the Earth, Lucid, a biochemist , did many things including experiments on the effect of weightlessness on the human body. Pictured above , Lucid greets the astronaut that will replace her on Mir , John Blaha . NASA astronauts can float free in space without any connection to a spaceship. This picture was taken in 1984 and records this first untethered spacewalk. The MMU was developed because astronauts found tethers restrictive.
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