Space plane hits milestone

Space plane hits milestone


An Air Force X-37B robotic space plane is shown after it landed at Vandenberg Air Force Base in California. The fourth mission of the program is now underway and just passed 600 days in Earth orbit.

An Air Force X-37B robotic space plane is shown after it landed at Vandenberg Air Force Base in California. The fourth mission of the program is now underway and just passed 600 days in Earth orbit.  (USAF/Boeing)

The U.S. Air Force"s mysterious X-37B space plane has now spent 600 days in Earth orbit on the vessel"s latest mission, and is nearing a program record for longest time spent in space.

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