An unmanned X-37B space plane landed at the Kennedy Space Center in Florida on Sunday, wrapping up a record 780 days in orbit, the US Air Force said Sunday. The mission breaks the mysterious plane’s own record by spending more than two years in space.
… The Boeing-built space planes resemble a smaller version of NASA’s old space shuttles. They feature a small payload bay and use a deployable solar array for power.
… The X-37B is designed to serve as a platform for experiments, but because the program is classified, the Air Force reveals few details about the exact nature of those experiments.