US Air Force's Mysterious X-37B Space Plane Passes 500 Days in Orbit
Thursday, April 24, 2014 - 06:41
in Astronomy & Space
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.