The purpose of the U.S. military's space plane is classified, only fueling speculation about why it has been orbiting Earth for nearly two years on this, its third mission.
The plane is expected to land this week at a Southern California Air Force base.
Credit: AP Photo /Vandenberg Air Force Base
A top-secret space plane landed Friday at an Air Force base on the Southern California coast.
The plane spent nearly two years circling Earth on a classified mission. Known as the Boeing X-37B, it resembles a mini space shuttle.
It safely touched down at 9:24 a.m. Friday, officials at Vandenberg Air Force Base said.
Just what the plane was doing during its 674 days in orbit has been the subject of sometimes spectacular speculation.
Other theories sound straight out of a James Bond film, including that the spacecraft would be able to capture the satellites of other nations or shadow China's space lab.
In a written release announcing the return of the craft, the Air Force only said it had been conducting "on-orbit experiments."
The Boeing X-37B program has been an orphan of sorts, bouncing since its inception in 1999 between several federal agencies, NASA among them. It now resides under the Air Force's Rapid Capabilities Office.
The plane that landed Friday is one of two built by Boeing. This is the program's third mission, and began in December 2012.
The plane stands 9 1/2 feet tall and is just over 29 feet long, with a wingspan under 15 feet. It weighs 11,000 pounds and has solar panels that unfurl to charge its batteries once in orbit.
The Air Force said it plans to launch the fourth Boeing X-37B mission from Cape Canaveral, Florida, next year.
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