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Canceled Space Shuttle missions
During the Space Shuttle program, several missions were canceled. Many were canceled as a result of the ''Challenger'' and the ''Columbia'' disasters. Many early missions were canceled due to delays in the development of the shuttle. Others were canceled because of changes in payload and missions requirements.
== Canceled due to the late development of the shuttle ==
In 1972, NASA's planners had projected for 570 shuttle missions between 1980 and 1991.〔Turnill, p.73〕 Later, this estimate was lowered to 487 launches between 1980 and 1992.〔Turnill, inner cover〕 The details of the first 23 projected missions, listed in the third edition of ''Manned Spaceflight'' (Reginald Turnill, 1978) and the first edition of the ''STS Flight Assignment Baseline'', an internal NASA document published in October 1977, are presented below.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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