US Military's Secretive Spaceplane Launched on Possible Higher-Orbit Mission

FILE - 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, May 7, 2017. (US Air Force/Handout via Reuters)

The U.S. military's secretive X-37B robot spaceplane blasted off from Florida on Thursday night on its seventh mission, the first launched atop a SpaceX Falcon Heavy rocket capable of delivering it to a higher orbit than previous missions.