The U.S. Air Force's unmanned X-37B has been in orbit for more than 630 days. The space plane has been on a classified mission for almost two years now evidently known as the Orbital Test vehicle-3, or OTV-3. The plane, or ship actually looks like a smaller Space Shuttle. Thought it was really interesting, and cool to hear about.
Subject: X-37B Space Plane's historical mission 
Thu Sep 04, 2014 2:37 pm