Safely home after a clandestine trip to parts unknown, the X-37B experimental spacecraft reappeared in Earth's orbit and is expected to make landfall later this week. Although the official story provided by the U.S. Air Force claims that the X-37B is simply a prototype of a reusable spacecraft, the ship's launch over two years ago caused a stir in the amateur astronomer community. A few months after the ship entered orbit, the X-37B vanished from hobbyist's telescopes only to reappear earlier this month. Leaked documents point towards the X-37B being the first test flight of the U.S. Air Force's wormhole propulsion drive.