Amos Kear, 9, left, and Nate Wilson, 8, look at the surface of the planet Mars, seated in the Lockheed Martin "Mars Experience" bus. The boys and their classmates from Virginia's Loch Lomond Elementary School robotics team were the first group of local students to visit the bus at the the Steven F. Udvar-Hazy Center in Chantilly, Va., October, 19, 2018, following a ceremony in which Lockheed Martin transferred the bus to Smithsonian's National Air and Space Museum. The bus, fitted with high-definition monitors on the windows, provides visitors an opportunity to experience the Martian surface. (National Air and Space Museum photo by Daniel Soñé)