A United States Air Force space plane is quietly making its fourth mission into orbit Wednesday, for reasons that are top secret. The unmanned X-37B spacecraft, which NASA says is similar in design to some of its retired space shuttles, was made specially for the Air Force by Boeing.
What will this mysterious vessel be doing in space? "The test mission furthers the development of the concept of operations for reusable space vehicles, and fine-tunes technical parameters for an affordable, reusable space vehicle," Air Force spokesman Capt. Christopher M. Hoyler told The Times.
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