Space Shuttle gliding and landing; it was originally intended to be outfitted for orbital operations after the test program, but it was found more economical to upgrade the structural test article STA-099 into orbiter "Challenger" (OV-099). An additional test article, dubbed "Pathfinder" (OV-098), was built for form and fit tests, and is on display at the Alabama Space and Rocket Center in Huntsville, AL. "Challenger" disintegrated 73 seconds after launch in 1986, and "Endeavour" was built as a replacement from structural spare components. Building "Endeavour" cost about US$1.7 billion. "Columbia" broke apart over Texas during re-entry in 2003. A Space Shuttle launch
Space policy of the United States of his term in 1968. Apollo 11, the first Moon landing, occurred early in Richard Nixon's presidency, but NASA's budget continued to decline and three of the planned Apollo Moon landings were cancelled. The Nixon administration approved the beginning of the Space Shuttle program, but did not support funding of other projects such as a Mars landing, colonization of the Moon, or a permanent space station. On January 5, 1972, Nixon approved the development of NASA's Space Shuttle program, a decision that profoundly influenced American efforts to explore and develop space for several decades thereafter. Under the Nixon administration, however,