 An identically constructed flight backup of Explorer 1 is on display in the Smithsonian Institution's National Air and Space Museum, Milestones of Flight Gallery in Washington, DC.Launch Pad 26 was deactivated in 1963, and was designated for use as a museum in 1964, the Air Force Space and Missile Museum.Here too, a full-scale Explorer 1 is on display, but this one is a mockup.