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On April 22, 2010, the U.S. Air Force launched the super-secret X-37B space plane on its first spaceflight. [‘On This Day in Space’ Video Series on Space.com] This space plane is also known as the ...

The Air Force's experimental X-37B space plane announced the end of its nearly two-year mission by creating a sonic boom on Sunday that surprised residents along Florida's Space Coast. Officials have ...

B space plane has landed at NASA's Kennedy Space Center in Florida.