Astronaut Piers J. Sellers, STS-121 mission specialist, participates in the mission's first session of extravehicular activity (EVA) while the Space Shuttle Discovery was docked with the International Space Station.
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Astronaut Piers J. Sellers, STS-121 mission specialist, participates in the mission's first session of extravehicular activity (EVA) while the Space Shuttle Discovery was docked with the International Space Station.