While no one knows what the X-37B's true objectives are, some speculate that it could be used as a space weapon or spy tool.
The U.S. Airforce's X-37B Orbital Test Vehicle mission 4 after landing at NASA's Kennedy Space Center Shuttle Landing Facility in Cape Canaveral, Florida, U.S., May 7, 2017. (photo credit: REUTERS)ByRACHEL WOLF
