Secret military space plane will launch on its fourth mission Wednesday

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A military space plane that is shrouded in secrecy is set to launch into space on its latest (mostly) secret mission Wednesday.

The U.S. Air Force's uncrewed X-37B space plane is due to blast off atop an Atlas V rocket for its fourth space mission on May 20 from Cape Canaveral Air Force Station in Florida. The rocket could launch anytime during the launch window from 10:45 a.m. ET to 2:45 p.m. ET.

See also: Here's what we know about the Air Force space plane's mystery mission

Although military officials are keeping a tight lid about much of what the space plane will be doing during its mission, there are a few things we do know about the miniature shuttle-shaped vehicle. Read more...

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