The U.S. Air Force's unmanned X-37B shot off into space for the fourth time today. The extreme secrecy shrouding all three previous missions have fuelled plenty of conspiracy theories. But for once, we actually have some inkling of what the X-37B will do.
Before the launch, officials actually revealed two of the experiments onboard, which you can read about in our prior coverage below. What else is there? That's classified, of course. General John Hyten of the Air Force Space Command told 60 Minutes the plane is "really for cool things," so take that as you will.
Top photo of the launch via ULA/Twitter