ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
William Herschel Telescope (WHT) mirror. The shielding segments are unfolding to reveal the WHT's primary 4.2-metre mirror (lower frame). The WHT is part of the Isaac Newton Group of telescopes at the Roque de Los Muchachos Observatory on the island of La Palma in the Canary Islands. It is one of the largest optical telescopes in Europe. Photographed in 2006.
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