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Tracy Caldwell

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Space Station_Lea.jpg

Space Station_Lea.jpg

Expedition 24 astronauts Tracy Caldwell Dyson and Douglas Wheelock work outside the International Space Station on Monday, Aug. 16, 2010, as they prepare to install a cooling pump module, replacing one that failed. (AP Photo/NASA)

_Space_Station.sff.jpg

_Space_Station.sff.jpg

In a photo made from NASA television, Expedition 24 astronaut Tracy Caldwell Dyson works outside the space station Monday Aug. 16, 2010 as she and Douglas Wheelock prepare to install a cooling pump module, replacing the one that failed. (AP Photo/NASA)