On its second test flight, the USAF's X-37B unmanned spaceplane has far exceeded it's supposed maximum flight time of 270 days, and there's no indication when it might land.
Exactly what it's doing out there is unclear-- the USAF isn't telling-- but as its orbit takes the craft repeatedly over the Middle East and Afghanistan, some speculate it might be on an intelligence-gathering mission.
Officially, the USAF says the X-37B is testing new technologies, which could cover just about anything.
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