NASA John H. Glenn Research Center at Lewis Field is a NASA center, located within the cities of Brook Park and Cleveland between Cleveland Hopkins International Airport and the Cleveland Metroparks’s Rocky River Reservation, with a subsidiary facility in Sandusky, Ohio.
Glenn Research Center is one of ten major NASA field centers, whose primary mission is to develop science and technology for use in aeronautics and space.
As of May 2012, it employed about 1,650 civil servants and 1,850 support contractors located on or near its site.
The Zero Gravity Research Facility is a vertical vacuum chamber used for microgravity experiments. It was designated a National Historic Landmark in 1985. The facility uses vertical drop tests in a vacuum chamber to investigate the behavior of components, systems, liquids, gases, and combustion in such circumstances.
The facility consists of a concrete-lined shaft, 28 feet (8.5 m) in diameter, that extends 510 feet (160 m) below ground level. An aluminum vacuum chamber, 20 feet (6.1 m) in diameter and 470 feet (140 m) high, is contained within the concrete shaft.
After the closing of the Japan Microgravity Centre (JAMIC), the NASA Zero-G facility is the largest microgravity facility in the world.