US Air Force's Mysterious X-37B Space Plane Passes 500 Days in Orbit
Friday, April 25, 2014 12:43 PM
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.
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