After spending more than a year orbiting our planet on a hush-hush mystery mission, the U.S. Air Force's X-37B space plane is due to return to Earth any day now. Air Force officials haven't announced ...

-America’s X-37B space plane looks like a scaled-down shuttle, but it has become one of the most consequential military programs of the post-Cold War era. -Born as a NASA technology demonstrator and ...

Officially designated the Orbital Test Vehicle (OTV), the X-37 program began in 1999 under NASA as a testbed for reusable spacecraft technologies, ie., advanced thermal protection, autonomous reentry, ...