ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
William Herschel Telescope (WHT). Scientist (lower left) looking past the back of the WHT's secondary mirror towards the primary 4.2-metre mirror, in which he is reflected. 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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