Astronaut Michael E. Fossum, an STS-121 mission specialist, participates in the mission's second extravehicular activity. During the more than six-hour spacewalk, Fossum and fellow astronaut Piers J. Sellers restored the International Space Station's Mobile Transporter rail car to full operation and delivered a spare pump module.
Astronaut Michael E. Fossum, an STS-121 mission specialist, participates in the mission’s second extravehicular activity. During the more than six-hour spacewalk, Fossum and fellow astronaut Piers J. Sellers 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.Image credit: NASA