Students from the Manassas, Virginia's Loch Lomond Elementary School robotics team were the first ones to board the Lockheed Martin "Mars Experience" bus after a morning ceremony at the Steven F. Udvar-Hazy Center in Chantilly, Va., October, 19, 2018.  Lockheed Martin donated the bus, fitted with high-definition monitors on the windows, which provide visitors an opportunity to experience the Martian surface.  (National Air and Space Museum photo by Daniel Soñé)