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ISS023-E-022222 (13 April 2010) --- Dwarfed by components of the International Space Station, NASA astronaut Rick Mastracchio (bottom center), STS-131 mission specialist, is seen working near the Quest airlock during the mission's third and final session of extravehicular activity (EVA) as construction and maintenance continue on the orbital complex. During the six-hour, 24-minute spacewalk, Mastracchio and astronaut Clayton Anderson (out of frame), mission specialist, hooked up fluid lines of the new 1,700-pound tank, retrieved some micrometeoroid shields from the Quest airlock’s exterior, re…
