Explorer 1

This is a replica of the Explorer 1 spacecraft in the Air & Space Museum. It hangs roughly directly above the Viking lander. Explorer 1 was the first United States satellite and is credited with discovering the Van Allen radiation belts. It was launched on a Jupiter rocket in January 1958. This image was taken at 238mm focal length with an exposure of 1/160 seconds at f/6.3, ISO 1600.