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NOAO / AURA / NSF / SCIENCE PHOTO LIBRARY NOAO / AURA / NSF / SCIENCE PHOTO LIBRARY
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Mayall 4-metre telescope at Kitt Peak National Observatory (KPNO) in Arizona, USA. The Nicholas U. Mayall Telescope is a reflector telescope that makes observations in visible light. It began operating in 1973. Photographed in 2001, showing the new-style primary mirror covers.
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