|The second of its kind to be sent up by the U.S. Air Force - but its purpose has never fully been explained|
The U.S Air Force’s highly secret unmanned space plane will land in June - ending a year-long mission in orbit.
The experimental Boeing X37-B has been circling Earth at 17,000 miles per hour and was due to land in California in December. It is now expected to land in mid to late June.
One has to wonder what its' true purpose is.
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