Add Yahoo as a preferred source to see more of our stories on Google. On April 22, 2010, the U.S. Air Force launched the super-secret X-37B space plane on its first ...
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 ...
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