Space Shuttle landing at Edwards, the orbiter was flown back to the KSC on the Shuttle Carrier Aircraft, a specially modified Boeing 747. The first orbiter, "Enterprise", was built in 1976, used in Approach and Landing Tests and had no orbital capability. Four fully operational orbiters were initially built: "Columbia", "Challenger", "Discovery", and "Atlantis". Of these, two were lost in mission accidents: "Challenger" in 1986 and "Columbia" in 2003, with a total of fourteen astronauts killed. A fifth operational (and sixth in total) orbiter, "Endeavour", was built in 1991 to replace "Challenger". The Space Shuttle was retired from service upon the conclusion
Space Shuttle Columbia a salute, a celebration rather than just concentrating on a few moments of tragedy, but instead the bigger picture of these brave people's lives." The graphic novel "Orbiter" by Warren Ellis and Colleen Doran was dedicated to the "lives, memories and legacies of the seven astronauts lost on space shuttle "Columbia" during mission STS-107." Laurel Clark's wake up call on STS – 107 was Runrig's "Running to the Light". Laurel took "The Stamping Ground" CD into space with her and when the Shuttle exploded the CD was found back on Earth, and presented to the band. "Somewhere", the final track