DiscoverySpace Shuttle Discovery returns to the International Space Station to add another major structural truss, resupply the station, and swap crew members. During this flight, the 75th spacewalk involving station construction takes place, moving part of the station’s solar power apparatus to another part of the station. Aboard Discovery for this flight are Commander Mark Polansky, Pilot William Oefelein, and mission specialists Robert Curbeam, Joan Higginbotham, Nicholas Patrick, Christer Fuglesang and Sunita Williams, who will stay on the International Space Station as its new flight engineer. Returning with Discovery is Thomas Reiter, who was flown to the station aboard Discovery in July.