Last updated on April 20, 2014 at 7:43 EDT
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May 31, 2011
Astronauts William M. Shepherd (top), mission specialist, and Guy S. Gardner, pilot, float on the middeck of the Earth-orbiting Space Shuttle Atlantis. Sleep stations are seen in the background. Just above Shepherd's head is part of the new escape pole that will be on each craft in the shuttle fleet, an added element following the Challenger accident of January 1986. Shepherd is strapped to a chair which floats with him.