Astronaut Stephanie D. Wilson, STS-121 mission specialist, and European Space Agency (ESA) astronaut Thomas Reiter, Expedition 13 flight engineer, bid farewell to one another prior to the undocking of the Space Shuttle Discovery and the International Space Station, on 15 July 2006. Cosmonaut Pavel V. Vinogradov, Expedition 13 commander representing Russia's Federal Space Agency, is at right.