The Air Force wants you to know about its secret robotic spacecraft, the X-37B

The Air Force has a secret space robot called the X-37B. We know this because the Air Force is very proud of the X-37B, though we don't know exactly why, and the Air Force won't really say. It returned to earth last night, after almost two years in space, and it did so with a not-so-secret sonic boom, heard by residents in the greater Orlando metropolitan area, 24th largest in the United States. When the X-37B landed yesterday, it was after 718 days conducting "on-orbit experiments," according to the Air Force. It's hard to say, specifically because the people in charge are only referring to the mission in vague terms.