SpaceX to Launch US Military's Secret ‘Space Plane’ Monday After Delay

Little is known about the largely classified mission, USSF-52, or its X-37B space plane, also known as the Orbital Test Vehicle (OTV). Similar in shape and design to NASA’s iconic Space Shuttle, the X-37B is tiny in comparison, with a wingspan of 15 feet and a length of 29 feet. NASA’s space shuttle was 122 feet long and had a wingspan of 78 feet.