DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Telescope mirror (lower centre) of one of the units of the Very Large Telescope (VLT). The VLT is at the European Southern Observatory's (ESO) Cerro Paranal site in Chile. The VLT consists of four such telescopes in separate buildings. Images from the four telescopes can be combined by interferometry to produce an image equivalent to that of seen by a 16-metre diameter mirror. This makes the VLT one of the world's largest optical telescopes. The 8.2-metre diameter mirror is carried on an azimuthal mount which rotates both vertically and horizontally.
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