The Otherworldly Work of West Virginia's Green Bank Radio Telescope

Early Model
The giant Green Bank Telescope is just one of several instruments at the Observatory, Beginning in 1957, when the Observatory became operational, the National Radio Astronomy Observatory has erected a number of radio telescope for use by visiting astronomers. This 140-foot diameter instrument built in the 1960's remains the largest equatorial telescope in the world. It was the first to discover signals from formaldehyde in interstellar space. It was retired from general use when the Green Bank Telescope began operations, but was subsequently refurbished and is now used for studies of the ionosphere.

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