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The Last Great Telescope

The Green Bank Telescope (GBT) is the world’s largest fully steerable radio telescope and the world’s largest land-based movable structure. It is part of the National Radio Astronomy Observatory (NRAO) site at Green Bank, West Virginia, USA. NRAO is located in the National Radio Quiet Zone, a 13,000 mile zone where all radio transmissions are either limited or banned outright, to help the telescope function properly. With the growing popularity of radio-array telescopes, the GBT may end up being the last single-dish telescope of its kind built in the world. 

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