ROYAL OBSERVATORY, EDINBURGH / SCIENCE PHOTO LIBRARY ROYAL OBSERVATORY, EDINBURGH / SCIENCE PHOTO LIBRARY
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The Anglo-Australian Telescope (AAT). The principal mirror of this optical telescope has a diameter of 3.9 metres & lies at the bottom of the white frame. During the day it is protected by an array of steel petals that are seen here in open position. The yellow, horseshoe-shaped frame is part of the supporting structure. AAT was one of the first electronically controlled telescopes. Its size is shown by the figure on the catwalk at bottom left. AAT is sited at 1200 metres on Siding Spring Mountain in New South Wales, Australia.
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