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ISS024-E-011609
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ISS024-E-011609

June 1, 2014
(7 Aug. 2010) --- Attired in her Extravehicular Mobility Unit (EMU) spacesuit, NASA astronaut Tracy Caldwell Dyson, Expedition 24 flight engineer, prepares to exit the Quest airlock of the International Space Station to begin the first of three planned spacewalks to remove and replace an ammonia pump module that failed July 31.


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