Space Shuttle Discovery Mission To International Space Station
IN SPACE - SEPTEMBER 1: Flight engineer Nicole Stott of the space shuttle Discovery works during a six-and-a-half hour spacewalk performed overnight between Tuesday night and Wednesday morning September 1, 2009. Stott and mission specialist John "Danny" Olivas (not pictured) removed an empty ammonia tank from the station's truss and will replace it with a new module during a follow-up spacewalk later in the week. (Photo by NASA via Getty Images)
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