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February 9, 2012
ISS023-E-020975 (9 April 2010) --- NASA astronaut Clayton Anderson, STS-131 mission specialist, participates in the mission's first session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 27-minute spacewalk, Anderson and astronaut Rick Mastracchio (out of frame), mission specialist, helped move a new 1,700-pound ammonia tank from space shuttle Discovery's cargo bay to a temporary parking place on the station, retrieved an experiment from the Japanese Kibo Laboratory exposed facility and replaced a Rate Gyro Assembly on one of the truss segments.

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