Mysterious Air Force space plane lands after 15 months in orbit
An unmanned space plane built by Boeing, the second of its kind, returns to Earth after 463 days in orbit for a clandestine mission.
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Little has been said publicly about the second X-37B flight and operations. At a budget hearing before the Senate Armed Services subcommittee in March, William Shelton, head of the Air Force Space Command, made a passing mention.Skip to next paragraph
In Pictures The X-37 space plane
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That the second X-37B has stayed longer in space than the first shows "the flexibility of this unique system," he told lawmakers.
Defense analysts are divided over its usefulness.
"Having a vehicle with a broad range of capabilities that can get into space quickly is a very good thing," she said.
Yousaf Butt, a nuclear physicist and scientific consultant for the Federation of American Scientists, thinks the capabilities of the X-37B could be done more cheaply with a disposable spacecraft.
"I believe one of the reasons that the mission is still around is institutional inertia," he said.
The arc of the X-37 program spans back to 1999 and has changed hands several times. Originally a NASA project, the space agency in 2004 transferred it to the Pentagon's research and development arm, DARPA, and then to the secretive Air Force Rapid Capabilities Office. Hundreds of millions of dollars have been poured into development, but the current total spent remains a secret.
Built by Boeing Government Space Systems, a unit of the company's satellite manufacturing area, the 11,000-pound space plane stands 9 1/2 feet tall and is just over 29 feet long, with a wingspan of less than 15 feet. It possesses two angled tail fins rather than a single vertical stabilizer. Once in orbit, it has solar panels that unfurl to charge batteries for electrical power.
McDowell of the Jonathan's Space Report sees a downside. He noted it'll be tough for the Air Force to send up such planes on short notice if it has to rely on the Atlas V rocket, which requires lengthy preparations.
"The requirement to go on Atlas V is a problem; they may need to look at a new launch vehicle that would be ready to go more quickly," he said.