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The location in West Virginia, of a radio astronomy observatory forming part of the facilities of the National Radio Astronomy Observatory of the USA. The 92-metre (300-foot) dish built in 1962 collapsed in 1988 and was a total loss. Its successor, the 100-metre (325-foot) Green Bank Telescope, is due for completion in 1998. It is the largest fully steerable dish in the world. An unusual off-axis feed arm means that the dish is not obstructed. The 43-metre (140-foot) dish at Green Bank, completed in 1965, is the largest equatorially mounted telescope in the world. There is also a radio interferometer, consisting of three 26-metre (85-foot) dishes, two of which can be moved along a track 1.6 km (1 mile) long.
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