That’s the Air Force’s super-secret unmanned X-37B space plane hitching a ride on an Atlas V rocket yesterday. No one knows what its mission is. Or even when it’s coming back. https://gizmodo.com/air-force-to-launch-military-orbital-spaceplane-5030769 The rumors about the X-37B have been building for a few years now, ever since the project came under the auspices of the…