Stock Photo Description: ISS013-E-49639 (8 July 2006) --- Astronaut Piers J. Sellers, STS-121 mission specialist, participates in the mission's first session of extravehicular activity (EVA) while Space Shuttle Discovery was docked with the International Space Station. Astronaut Michael E. Fossum, mission specialist, who was also on the spacewalk with Sellers and took this photo, appears as a small reflection in Seller's helmet visor. Earth's horizon and a portion of a station solar array are also visible in the reflection.
