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      Florida space center is home to secret spacecraft

      CAPE CANAVERAL, Fla. -- The Kennedy Space Center will be the testing site for a top-secret Air Force space plane.

      Boeing is the contractor working on the spacecraft, and the company announced Friday that it will convert a former space shuttle building for the X-37B orbital test vehicle program.

      An undisclosed number of workers will recover, refurbish and relaunch the 29-foot-long unmanned spacecraft.

      The Air Force launched the most recent flight of the unmanned spacecraft from Florida's Space Coast more than a year ago.

      It was the second flight for the original X-37B space plane. The craft circled the planet for seven months in 2010. A second X-37B spacecraft spent more than a year in orbit.

      The mystery machines are about one-quarter the size of NASA's old space shuttles and can land automatically on a runway.