Secretive X-37B Space Plane Launches on New Mystery Mission
2011-03-07 0:00

By Mike Wall |

After being delayed a day by bad weather, the U.S. Air Forceís second X-37B robotic space plane blasted off from Florida this afternoon (March 5) on a mystery mission shrouded in secrecy.

The Air Forceís second X-37B space plane soars toward space atop an Atlas 5 rocket after launching from Cape Canaveral Air Force Station in Florida on March 5, 2011.
CREDIT: United Launch Alliance

The unmanned X-37B mini-shuttle ó known as Orbital Test Vehicle 2 (OTV-2) ó took to the skies from Cape Canaveral at 5:46 p.m. EST (2246 GMT) today, tucked away in the nose cone atop a huge Atlas 5 rocket.

"Liftoff of the Atlas 5 rocket and the second experimental X-37B, Americaís miniature military space shuttle," the Air Force Space Command wrote in a Twitter post as the Atlas 5 streaked into the Florida skies.

The space plane was originally scheduled to launch yesterday, but cloudy, windy conditions scrubbed two attempts. And a technical glitch caused the X-37B to miss a launch window earlier this afternoon; a faulty valve had to be replaced in a last-minute repair.

The X-37Bís mission is classified, but Air Force officials have said the vehicle will be used to test out new spacecraft technologies. Shortly after launch, the mission went into a scheduled media blackout, with no futher public updates.

Todayís launch marks the start of the X-37B programís second space mission. The Air Forceís other X-37B plane, known as OTV-1, returned to Earth in December 2010 after a similarly mysterious seven-month maiden mission.

Mysterious mini-shuttle

The X-37B spacecraft looks a bit like NASAís space shuttles, only much smaller. The vehicle is about 29 feet long by 15 feet wide (8.8 by 4.5 meters), with a payload bay about the size of a pickup truck bed. By comparison, two entire X-37Bs could fit inside the payload bay of a space shuttle.

The space plane, built by Boeing for the U.S. military, can fly long, extended missions because of its solar array power system, which allows it to stay in orbit for up to nine months, Air Force officials have said.

What exactly the vehicle does while circling the Earth for so long is a mystery, since the craftís payloads and missions are classified. Partly as a result of the secrecy, some concern has been raised ó particularly by Russia and China ó that the X-37B is a space weapon of some sort.

But the Air Force has repeatedly denied that charge, claiming that the X-37Bís chief task is testing out new hardware for future satellites ó instruments like sensors and guidance, control and navigation systems. And thatís likely to be the case, experts say.

"It gives the Air Force the ability to test-fly some of this hardware," said Brian Weeden, a former Air Force orbital analyst who works as a technical adviser for the nonprofit Secure World Foundation.

Weeden suspects the X-37B is testing gear for the National Reconnaissance Office, the intelligence agency that builds and operates the U.S.ís spy satellites. That would explain all the secrecy, he said.

CREDIT: Karl Tate,

Second mission for the X-37B

The Air Forceís other X-37B, known as OTV-1, launched last April and returned in December after spending 224 days in space. While its mission was also classified, technology-testing was OTV-1ís primary job, too, Air Force officials have said.

And things presumably went well, experts say, or the Air Force wouldnít be launching the craftís twin a few short months later.

While the X-37B is likely trying out new hardware, the vehicle itself is experimental ó hence the "X" designation ó so these flights should also help the Air Force assess the space plane as well as its payload.

"Part of its mission is to test out reusable technologies and to see how quickly they can turn around these vehicles and launch them again," Weeden said.

Boeingís Space and Intelligence Systems division builds the X-37B for the Air Force. Originally, NASA used the space plane as an experimental test bed until funding for the project ran out in 2004.

The vehicle then passed to the Defense Advanced Research Projects Agency and was ultimately turned over to the Air Force in 2006.

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