Fitxer:Piers Sellers spacewalk.jpgPiers Sellers during the third spacewalk of STS-121, a demonstration of orbiter heat shield repair techniques. Français : L'astronaute Piers Sellers durant
Fitxer:Piers Sellers (27368446583).jpgDescriptionPiers Sellers (27368446583).jpg Piers Sellers talks about climate at NASA's Goddard Space Flight Center in Greenbelt, Md. Credit: NASA/Goddard/Rebecca