Effelsberg radio telescope. This 100-metre telescope was inaugurated in 1972 and is one of the world's largest fully steerable radio telescopes, opera

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Effelsberg radio telescope. This 100-metre telescope was inaugurated in 1972 and is one of the world's largest fully steerable radio telescopes, operating at wavelengths from about 7 millimetres to 90 centimetres. It is operated by the Max Planck Institut fur Radioastronomie at the University of Bonn in Germany and has been used in several astronomical surveys. For nearly 30 years it was the largest fully steerable radio telescope until the opening of the Green Bank Telescope in Green Bank, West Virginia, USA, in 2001.

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Photo credit: © DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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