A top secret space plane named X-37B goes into orbit today, in a secretive experimental program run by the Air Force.
The plane is capable of remaining in space for around 2 years, and the Air Force have not revealed what is on board.
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The mini military space plane is poised for liftoff Wednesday on another long orbital test flight.
The three previous missions also began with rocket launches from Cape Canaveral Air Force Station.
The mystery test vehicle — essentially a technology test bed — is designed to orbit the Earth and then land like one of NASA’s old shuttles.
It is operated robotically, without anyone on board, and is reusable.
It is 29 feet long — about one-fourth the size of a NASA shuttle.
The longest X-37B flight lasted about 675 days; touchdown was last October.
There’s no official word on how long this one will stay up.
All three previous missions ended in California.
NASA has a materials experiment aboard, while the Planetary Society is tagging along with a solar-sail demo.
Although largely mum about this X-37B flight, the Air Force has acknowledged a thruster experiment involving electric propulsion.
Air Force researchers want to check design modifications to ion thrusters already flying on some advanced military communication satellites.
Wednesday’s liftoff of the Atlas V rocket is scheduled for 11:05 a.m.
However, in an unprecedented disclosure, earlier this month the Department of Defense did reveal some details about the X-37B latest mission, which is due to take off on May 20.
‘[We] are investigating an experimental propulsion system on the X-37B on Mission 4,’ Captain Chris Hoyler, an Air Force spokesman, told Space.com.
‘The Air Force Rapid Capabilities Office will also host a number of advance materials onboard the X-37B for Nasa to study the durability of various materials in the space environment,’ Hoyler added.
Spaceflightnow.com revealed more details of the flight, which is described as a ‘hall thruster electric propulsion test.’
It is intended to improve performance of the units onboard Advanced Extremely High Frequency (AEHF) military communications spacecraft, officials said today.
AEHF satellites’ Hall thrusters are 4.5-kilowatt units that use electricity and xenon to produce thrust for moving satellites in space.
The benefit of using electric propulsion is that its xenon fuel weighs much less than traditional hydrazine.
This technology could help in the development of technologies to control satellites with better accuracy.
However, experts claim that refining an advanced manoeuvring thruster is probably just a small part of the vehicle’s true mission set.
One leading secrecy expert previously told DailyMail.com that the drone is ‘very likely’ be used to test technologies that will increase spying capabilities of the US.
‘The US government has a bottomless appetite for sensitive information,’ said Steven Aftergood, a secrecy expert at the Federation of American Scientists.
‘As powerful as our intelligence satellites may be, they also have their limitations – most notably the limitations imposed by their orbital parameters.
‘It’s conceivable that a spy plane would introduce new versatility into overhead reconnaissance.’
The X-37B space drone, otherwise known as the Orbital Test Vehicle, is blasted into orbit by a rocket. However, it lands using a runway like a normal aircraft.
The X-37B is too small to carry people onboard, but does have a cargo bay similar to that of a pickup truck, which is just large enough to carry a small satellite.
The X-program has bounced between several federal agencies, Nasa among them, since 1999.
The plane has been in space for a total of 674 days, far more than its two previous flights which lasted 225 and 469 days.
The program’s first mission launched in April 2010 and landed in December that year.
The second space plane took off on March 2011 and came back to Earth in June 2012.
According to X-37B manufacturer Boeing, the space plane operates in low-earth orbit, between 110 (177km) and 500 miles (800km) above earth.
By comparison, the International Space Station orbits at about 220 miles (350km).
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