The Green Bank Observatory (previously National Radio Astronomy Observatory, Green Bank) is an astronomical observatory located in the National Radio Quiet Zone in Green Bank, West Virginia, U.S. It is the operator of the Robert C. Byrd Green Bank Telescope, the world's largest fully steerable radio telescope.^[1]

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Green Bank Observatory

Green Bank Telescope at NRAO Green Bank, September 2009
Alternative names	National Radio Astronomy Observatory, Green Bank
Named after	Green Bank
Organization	Associated Universities, Inc.
Observatory code	256
Location	Green Bank, United States National Radio Quiet Zone, Pocahontas County, US
Coordinates	38°26′16″N 79°50′10″W
Altitude	2,684 feet (818 m)
Observing time	365 nights per year
Established	November 12, 1956 (1956-11-12)
Website	greenbankobservatory.org
Telescopes	300 foot Radio Telescope Ewen–Purcell Horn Antenna Green Bank Jansky Antenna 40-foot radio telescope Green Bank Interferometer Green Bank Telescope Reber Radio Telescope
Location of Green Bank Observatory
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The observatory was established as the National Science Foundation's (NSF) National Radio Astronomy Observatory (NRAO) in 1956 and made its first observations in 1958.^[2][3][4][5] It served as the NRAO's headquarters until 1966, after which the facility was known as the National Radio Astronomy Observatory, Green Bank.^[3][6]

In October 2016, the observatory became an independent institution following a 2012 recommendation that the NSF fully divest itself from the facility by October 1, 2016.^[4][7][8][9]

Green Bank Observatory subsequently retained partial NSF funding, established private contracts, and formed a partnership with West Virginia University.^[10][4] It is operated by the nonprofit Associated Universities, Inc., under a cooperative agreement with the National Science Foundation.^[10]

• Robert C. Byrd Green Bank Telescope^[1]
• 140 Foot (43m) Telescope^[11][12]
• 20 Meter Telescope^[11]
• 40 Foot Telescope^[11]

• 300 Foot Radio Telescope – the world's largest moving telescope, suddenly collapsed in November 1988 from the loss of a gusset plate^[13][14]
• Green Bank Interferometer
• Reber Radio Telescope – designated a National Historic Landmark in 1989
• Howard E. Tatel Radio Telescope — utilized in Project Ozma in 1960, the first search for extraterrestrial intelligence (SETI) with a radio telescope^[11][5][15]
• 45 Foot Telescope^[11]

• List of astronomical observatories