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Courtesy NASA
Commander Peggy Whitson (right), cosmonaut Yuri I. Malenchenko (center), and Malaysian spaceflight participant Sheikh Muszaphar Shukor demonstrate international cooperation on the space station in October 2007. With her two six-month tours on the station, Whitson has spent more time in space than any U.S. astronaut.
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Courtesy NASA
Whitson, the first woman commander of the space station, suited up for a seven-hour spacewalk right before Thanksgiving 2007 as construction continued on the station.
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Courtesy NASA
Whitson saying "ho ho ho" the zero-g way on Christmas Day 2007, with Malenchenko and flight engineer Daniel Tani.
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Whitson floats in the Destiny laboratory of the space station in March 2008.
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Liftoff! The space shuttle Discovery and its seven-member crew (including commander Pam Melroy) heads toward orbit and link-up with the International Space Station October 23, 2007.
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On Halloween 2007 crewmembers pose for a group photo on the space station. Shuttle commander Melroy is in the center. Whitson is at bottom left.
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Melroy and Whitson welcome mission specialists Scott Parazynski (left) and Doug Wheelock back from their successful spacewalk to repair the damaged solar wing of the station on November 3, 2007.
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Anchored to a foot restraint on the end of a boom, Parazynski assessed his repair work on the damaged solar array of the space station.
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Courtesy NASA
Station commander Whitson says goodbye to shuttle commander Melroy as crewmembers exit the station to board space shuttle Discovery on November 4, 2007 for their return trip home.
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Melroy and Whitson with mission specialist Stephanie Wilson while the shuttle Discovery is docked with the station.
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Backdropped by the blackness of space and Earth's horizon, space shuttle Discovery undocked from the station, with Melroy in command, to head home on November 5, 2007.
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Sunita Williams (left) and Joan Higginbotham float arm-in-arm near the shuttle's hatch, which leads into the space station. The shuttle docked with the station on December 11, 2006.
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Courtesy NASA
Flight engineer Williams smiles as she floats in the Destiny laboratory of the space station during the fourth day of her six-month stay in 2006 and 2007.
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Courtesy NASA
During long stays onboard the space station, it's vital to do both aerobic and resistance training to maintain fitness and bone health in zero-g. Here Williams, in May 2007, works her muscles on the Interim Resistive Exercise Device (IRED) equipment in the Unity node of the station.
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Courtesy NASA
Teacher astronaut Barbara Morgan checks her list on the middeck of space shuttle Endeavour while docked with the station on August 11, 2007.Chosen as a backup for the NASA Teacher in Space program back in the 1980s (before the Challenger accident) she waited 21 years to do this!
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Courtesy NASA
Morgan thinking about how she's going to teach her students about the physics of zero-gravity while she floats on the middeck of the shuttle in August 2007.
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