Stock Photo - NASA astronauts James P. Dutton Jr., STS-131 pilot; Tracy Caldwell Dyson (second right), Expedition 23 flight engineer; and Dorothy Metcalf-Lindenburger, mission specialist, assist astronaut Rick Mastracchio, mission specialist, with his Extravehicular Mobility Unit (EMU) spacesuit in the Quest airlock of the International Space Station in preparation for the start of the mission's second spacewalk.

Stock Photo: NASA astronauts James P. Dutton Jr., STS-131 pilot; Tracy Caldwell Dyson (second right), Expedition 23 flight engineer; and Dorothy Metcalf-Lindenburger.

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