CNN. ”Whatever it was doing up in space, we may never know, but the U.S. Air Force’s unmanned X-37B space plane returned to Earth this week, with still no details from the military on the nearly two-year mission.”
”The X-37B Orbital Test Vehicle mission 3 (OTV-3),” as the military calls it, touched down at Vandenberg Air Force Base in California on Friday morning after conducting experiments in orbit for 674 days, the military said.