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June 3, 2011
Astronaut James D. Halsell, Jr., mission commander, works out a bicycle ergometer onboard the Earth-orbiting Space Shuttle Columbia. Halsell, along with four other NASA astronauts and two payload specialists supporting the Microgravity Sciences Laboratory (MSL-1) mission were less than a fourth of the way through a scheduled 16-day flight when a power problem cut short their planned stay.

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