A top-secret space plane landed safely at a U.S. Air Force base on the Southern California coast after spending two years circling the Earth.
A unmanned US plane on a top-secret, two-year mission to space has returned to Earth and landed in California.
The aircraft, resembling a miniature space shuttle and known as the Orbital Test Vehicle or X-37B, spent 674 days in orbit around the planet.
Pictures released by the 30th Space Wing show it touching down at Vandenberg Air Force Base on Friday morning.
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