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  • US Air Force's Mysterious X-37B Space Plane Passes 500 Days in Orbit

    04/24/2014 9:19:06 AM PDT · by lbryce · 53 replies
    Space.com ^ | Aril 24, 2014 | Mike Wall, Senior Writer
    An unmanned military space plane has achieved a major longevity milestone, zipping around Earth for 500 days on a clandestine mission for the United States government. The U.S. Air Force's X-37B space plane launched on its third and latest mission on Dec. 11, 2012. As of today (April 24), the vehicle has been aloft for 500 days — far longer than its officially stated maximum orbital lifetime of 270 days. "Clearly, and understandably, the Air Force initially set the expected parameters [of the X-37B] conservatively, not really knowing what it could do until it was tested — which is what...