Stock Photo - Attired in their Extravehicular Mobility Unit (EMU) spacesuits, astronauts Scott Parazynski (left) and Doug Wheelock, STS-120 mission specialists; are pictured in the Quest Airlock of the International Space Station as the mission's fourth spacewalk draws to a close. Also pictured are astronauts Pam Melroy (center foreground), STS-120 commander, and Peggy Whitson, Expedition 16 commander.

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