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
Teacher in Space Project Barbara Morgan as her backup. McAuliffe was a high school social studies teacher from Concord, New Hampshire. She planned to teach two 15-minute lessons from the Space Shuttle. McAuliffe died in the Space Shuttle "Challenger" disaster (STS-51-L) on January 28, 1986. After the accident, Reagan spoke on national television and assured the nation that the Teacher in Space program would continue. "We'll continue our quest in space", he said. "There will be more shuttle flights and more shuttle crews and, yes, more volunteers, more civilians, more teachers in space. Nothing ends here; our hopes and our journeys continue." However, NASA