IMAGE 500_599\517.Lbm,The McMath solar telescope at Kitt Peak Observatory in Arizona is the largest of its kind, with a heliostat 2 metres across.
IMAGE 500_599\520.Lbm,The Mayall reflector, which has a mirror 4 metres across. Like most modern reflectors, it is of lightweight skeletal design.
IMAGE 500_599\539.Lbm,Telescope domes at the Roque de los Muchachos Observatory on La Palma in the Canary Islands. It is well located above the clouds.
IMAGE 800_899\845.Lbm,The Kuiper airborne observatory, which is based at NASA's Ames Research Center. It carries an infrared telescope, which becomes effective at high altitudes.
IMAGE 900_999\918.Lbm,NASA's infrared telescope on Mauna Kea, the massive volcanic peak in Hawaii.
IMAGE 900_999\921.Lbm,A 28-inch (71-cm) refracting telescope of the Royal Greenwich Observatory.
IMAGE 900_999\922.Lbm,The 3.9-metre reflector, Anglo-Australian Telescope, at the Siding Spring Observatory in New South Wales, Australia.
IMAGE 900_999\924.Lbm,Star trails over the domes of the Kapteyn and the Isaac Newton telescopes at the Roque de los Muchachos Observatory on La Palma, in the Canary Islands.
IMAGE 900_999\927.Lbm,Historically one of the most important telescopes ever built, the 100-inch (254-cm) Hooker telescope at Mount Wilson Observatory, California.
IMAGE 900_999\936.Lbm,The Jacobus Kapteyn 1-metre reflecting telescope at the Roque de los Muchachos Observatory on La Palma is, like most modern instruments, computer controlled.
IMAGE 900_999\942.Lbm,The 64-metre dish radio telescope at Parkes, New South Wales, Australia, used particularly to study quasars. It was also used to gather the signals from Voyager 2 at Uranus and Neptune.
IMAGE 900_999\943.Lbm,The heliostat on top of the McMath solar telescope at Kitt Peak Observatory, the biggest instrument of its kind in the world.
IMAGE 900_999\944.Lbm,The radio telescope at Arecibo on the Caribbean island of Puerto Rico. Its fixed dish is 308 metres across.
IMAGE 900_999\945.Lbm,A view of the Arecibo radio telescope from the ground, showing the receiving antenna suspended nearly 200 metres above the dish.
IMAGE 900_999\946.Lbm,Looking skywards from beneath the dish of the Arecibo radio telescope. The dish is made up of 38,778 perforated aluminium panels.
IMAGE 900_999\949.Lbm,The -metre radio telescope at Green Bank, West Virginia, before its collapse in the late 1980s.
IMAGE 900_999\950.Lbm,The 76-metre diameter radio telescope at Jodrell Bank, Cheshire, one of the largest fully steerable instruments in the world. Its early triumph was to track Sputnik 1, the world's first artificial satellite.
IMAGE 900_999\952.Lbm,A 25-cm reflecting telescope, a popular size for amateur astronomers. It is a Newtonian type, with eyepiece near the front of the telescope tube.
IMAGE 1900_99\970.Lbm,The giant main mirror of the William Herschel Telescope at the Roque de los Muchachos Observatory, La Palma, in the Canary Islands. It measures 4.2 metres across.
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