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Can Enterprise be upgraded to replace Columbia?

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Can Enterprise be upgraded to replace Columbia?

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Perhaps, but odds are against it happening. First off, a little backhistory: Enterprise was to be the second spaceworthy Shuttle, after Columbia. It would have gone back to Palmdale to be completed for spaceflight after the 747 drop tests and after Columbia was completed. In the end, NASA and Rockwell decided to upgrade the structural test article (STA-099) instead, mainly because it offered greater payload performance than Enterprise. STA-099 became OV-099 Challenger, which is why Challenger’s OV number was out of sequence with the rest. Enterprise was then donated to the Smithsonian Air & Space Museum, where it currently resides on display. Following the loss of Challenger, NASA briefly examined the possibility of making Enterprise operational, but for the same reasons as those justifying the decision to upgrade STA-099 instead, it was decided to use existing spare parts and build Endeavour instead. However, Endeavour was ordered just before the line shut down, and as a result was qu

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