This June 2009 photo made available by the U.S. Air Force via NASA shows the X-37B Orbital Test Vehicle at Vandenberg Air Force Base, Calif. On Wednesday, May 20, 2015, the Air Force launched its unmanned mini-shuttle from Cape Canaveral, Fla. Like the old shuttle, the X-37B launches vertically and lands horizontally, is reusable, and has lots of room for experiments. But no one flies on them; they are operated robotically. (Photo by U.S. Air Force via AP Photo)
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