ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Palomar Observatory dome with its shutter open, at night. This dome at the Palomar Observatory in California, USA, houses the Hale telescope, a reflector telescope named after the astronomer George Ellery Hale when it was completed in 1948. At about five metres (200 inches), it was the world's largest mirror telescope until the 6 metre Russian BTA-6 telescope was built in 1975. Many important advances in astronomy took place here, such as the first observation of a brown dwarf star and the first optical spectrum obtained from a quasar. The dome sits at an elevation of 1867 metres within the Palomar mountain range.
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