The sign on the Pegasus mockup.  It reads
    
    
    
    
    
    
    
PEGASUS
    
    
    
    The Pegasus satellite was used by NASA to record meteoroid impact on its
    instrumented surface and report back to Earth.  Launched by a Saturn I vehicle,
    the data reported helped NASA engineers design spacecraft that would safely
    withstand meteor strikes.  Size 14 ft by 96 ft deployed.