Astronaut Peggy A. Whitson (left), Expedition 16 commander, and Pam Melroy, STS-120 commander, take a moment for a photo in the Unity node of the International Space Station while Space Shuttle Discovery is docked with the station.
Astronaut Peggy A. Whitson (left), Expedition 16 commander, and Pam Melroy, STS-120 commander, take a moment for a photo in the Unity node of the International Space Station while Space Shuttle Discovery is docked with the station.