DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Cerro Tololo observatory. Cerro Tololo Inter- American Observatory (CTIO) near La Serena, Chile. The seven largest domes are (from left to right): 40- centimetre (16-inch) telescope; 1. Yale 1 metre telescope; Curtis-Schmidt telescope; 4 metre Victor Blanco telescope; 1. Ritchey-Chretien telescope; and the 0. The high altitude of Cerro Tololo (2200 metres), & the clear air above it, are ideal for the observatory because atmospheric distortions to incoming light are reduced. In 1997 Cerro Tololo is operated by the National Optical Astronomy Observatories (NOAO).
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