Astronaut Charles Walker on Space Shuttle Discovery Mision 51-A is conducting the McDonnell Douglas Electrophoresis Operations in Space (EOS) experiment on the flight deck. The EOS experiment was designed to explore ways of procesing materials in the weightles conditions of space. The flight deck and the living quarters on the Shuttle are the only presurised, but still weightles, part of the craft. The Space Shuttle, the world's first partially reusable launch vehicle, first flew on 12th April 1981 and has been used for all America's manned space misions ever since. Mision 51-A was launched on November 8th 1984.
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