Stock Photo - Astronaut Piers J. Sellers, STS-121 mission specialist, participates in the mission's second session of extravehicular activity (EVA). During today's six-hour 47-minute spacewalk, Sellers and astronaut Michael E. Fossum (out of frame), mission specialist, restored the International Space Station's Mobile Transporter rail car to full operation and delivered a spare pump module for the station's cooling system.

Stock Photo: Astronaut Piers J. Sellers, STS-121 mission specialist, participates in the mission's second session of extravehicular activity (EVA).

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