The U.S. Air Force's mysterious unmanned space plane, the X-37B, is about to come back to Earth after more than two years in orbit on a mission the military won't tell us much about.The X-37B is expected to land at Vandenberg Air Force Base in California, the Air Force said.
The base did not give an exact time for the landing, but a notice to aviators and mariners on the Federal Aviation Administration's website said airspace around the Southern California base would be closed from 8 a.m. to 5 p.m. PT Tuesday."Team Vandenberg stands ready to implement safe landing operations for the X-37B Orbital Test Vehicle, the third time for this unique mission," Col. Keith Baits, commander of the 30th Space Wing, said in a statement.
The X-37B, which looks like a small space shuttle, lifted off from Cape Canaveral in Florida on December 11, 2012. At the time, the Air Force said its mission would last about nine months.The X-37B "is designed to demonstrate reusable spacecraft technologies for America's future in space and operating experiments which can be returned to, and examined, on Earth," an Air Force statement said.
"Technologies being tested in the program include advanced guidance, navigation and control, thermal protection systems, avionics, high temperature structures and seals, conformal reusable insulation, lightweight electromechanical flight systems, and autonomous orbital flight, re-entry and landing."
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