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The secret space plane could be testing new technology for spy satellites
The X-37 as it might have looked should the project have continued under NASA
An artist's rendition of the X-37 sitting in the cargo bay of the Space Shuttle, as it might have done had the project been continued under NASA.
The X-37B is seen shortly after landing at Vandenberg Air Force Base in California after its first mission on December 3, 2010