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One of the signs accompanying the Skylab mockup. It reads

Skylab made nearly 35,000 orbits in a time period of 2,249 days and traveled a distance of 1 billion miles. Skylab crews I, II, and III spent 28 days, 59 days, and 84 days, respectively, in Earth-orbital missions.

The sign also shows the "Skylab Program Cluster Configuration," including the Command & Service Module, Apollo Telescope Mount, Multiple Docking Adapter, a docking port on the MDA, Airlock Module, Saturn Workshop, solar panels (pre-launch art which includes both solar arrays; one was torn off due to a mishap during launch), micrometeoroid shield, experiments, sleep compartment, waste compartment, and ward room.