* Mysterious space plane comes back
* And also, it landed itself. Smart, eh?
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THE US military's secretive X-37B unmanned space plane slipped out of orbit and landed itself in early morning darkness on Friday at a California airbase after a successful maiden flight that lasted more than seven months, the Air Force said.
Secret military shuttle lands itself
A miniature robotic shuttle has become the first US spaceship to land itself on a runway.
The stubby-winged, robotic craft fired its engine to begin re-entry into Earth's atmosphere and autonomously landed at 1.16am local time at coastal Vandenberg Air Force Base, 209km northwest of Los Angeles
Range safety officers were on hand to track its descent over the Pacific and activate a destruct mechanism if the landing needed to be aborted. There were no immediate reports of any sonic booms being heard.
Vandenberg released infrared camera video of the craft rolling to a stop, recovery crews approaching in vehicles and working around it in protective suits, much the way space shuttles are handled upon landing.
The Air Force had emphasised that the primary purpose of the flight was to test the craft itself but classified its actual activities in orbit, leading to speculation about whether it carried some type of spying system in its small payload bay.
Program manager Lt Col Troy Giese said in a statement that all objectives were completed and the landing culminated a successful mission.
The Air Force immediately announced that a second X-37B, which had only been revealed last April, is scheduled to be launched next spring.
The first X-37B, also known as the Orbital Test Vehicle, was carried into space atop an Atlas 5 rocket launched from Cape Canaveral, Florida, on April 22, 2010.
The flight followed the project's long and expensive journey from NASA to the Pentagon's research and development arm and then on to the secretive Air Force Rapid Capabilities Office. Hundreds of millions of dollars have been spent on the X-37 program, but the current total hasn't been released.
Built by Boeing Co's Phantom Works, the 5000kg craft is 2.9m tall and just over 8.8m long, with a wingspan of less than 4.6m. It has two angled tail fins rather than a single vertical stabiliser.
Solar panels deploy in orbit to charge batteries for electrical power.
Officials made public only a general description of the mission objectives: testing of guidance, navigation, control, thermal protection and autonomous operation in orbit, re-entry and landing.
Last spring, Gary Payton, Air Force undersecretary for space programs, rejected characterisation of the project as leading to the weaponisation of space.
Top priorities for the project are to demonstrate an inexpensive and fast turnaround, he said.
Need for extensive servicing such as replacement of many thermal tiles would make it unattractive, he said.
Mr Payton suggested the X-37B would be useful for rapidly putting many small satellites into orbit, with a turnaround time measured at 10-to-15 days or less, operating more like an SR-71 spy plane than a routine space launch vehicle.