Air Force's Mysterious X-37B Space Plane Passes 400 Days in Orbit
Wednesday, January 29, 2014 - 07:30
in Astronomy & Space
The X-37B launched on Dec. 11, 2012, meaning that it has been aloft for 413 days as of Tuesday (Jan. 28) on the third mission for the program. The endurance record is 469 days, set during the second flight, which launched in 2011.