US military’s mysterious X-37B spaceplane launched

The U.S. military's mysterious X-37B spaceplane has launched successfully on its multi-year orbital mission after weeks of delays. The robotic X-37B set atop a SpaceX Falcon Heavy booster lifted off from NASA's Kennedy Space Center in Florida on Thursday. This marks the seventh liftoff for the X-37B with its largely classified cargo, but its first time on SpaceX's Falcon Heavy.