The secretive U.S. Air Force X-37B robotic space plane has been cleared to lift off Tuesday (Dec. 11).
The X-37B vehicle and its cargo bay packed with a classified payload is set to make the third mission of the program. Also called Orbital Test Vehicle-3, or OTV-3, the unpiloted craft is slated to be hurled into Earth orbit by an Atlas 5 rocket from Florida's Cape Canaveral Air Force Station (CCAFS) at 1:03 p.m. EST (1803 GMT).
Source: Space.com. Read full article. (link)