NASA's Space Shuttle "Discovery" being prepared for retirement at the Kennedy Space Center.

A view of the cargo bay of NASA's Space Shuttle "Discovery" as it is being prepared for retirement at the Kennedy Space Center on June 21, 2011. Following its last mission, STS 133, NASA technicians have been "cleaning" the orbiter for display at the National Air and Space Museum near Dulles International Airport. .UPI/Joe Marino - Bill Cantrell