SSME at the Steven F. Udvar-Hazy Center. On November 28, 2011, the Space Shuttle Main Engine (SSME) was moved from display in the James S. McDonnell Space Hangar into the Mary Baker Engen Restoration Hangar, where it will remain until it is transported to the Museum in Washington DC to be placed on display in the Moving Beyond Earth exhibition.

Three SSME's plus two Solid Rocket Boosters (SRBs) powered the reusable Space Shuttle. Each SSME produces 375,000 lbs of thrust or a total of 1,125,000 lbs and uses liquid oxygen and liquid hydrogen as propellants.

This SSME is made of up of components of SSMEs that have flown into space. The flights have included the first four Shuttle missions (STS-1, STS-2, STS-3, STS-4), the second Hubble Space Telescope repair mission (STS-82), the missions that launched the Magellan (STS-30) and Galileo (STS-34) space probes, and the John Glenn flight (STS-95). The engine was donated by Rocketdyne to the Smithsonian in 2004.