Centaur Standard Shroud in the NASA Lewis Research Center's (now known as the Glenn Research Center) Space Power Facility, Plum Brook Station. The shroud protects the spacecraft during launch. When it was constructed, the Space Power Facility (SPF) was the world's largest vacuum chamber. It stands more than 122 feet high, 100 feet in diameter and provides a vacuum environment for the study of space propulsion. Originally commissioned for nuclear-electric propulsion studies, the SPF has been recommissioned for current and future use in the ongoing research and development of space propulsion systems.