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The 4C Array is a cylindrical paraboloid radio telescope at the
Mullard Radio Astronomy Observatory The Mullard Radio Astronomy Observatory (MRAO) is located near Cambridge, UK and is home to a number of the largest and most advanced aperture synthesis radio telescopes in the world, including the One-Mile Telescope, 5-km Ryle Telescope, a ...
, near Cambridge, England. It is similar in design to the
Molonglo Observatory Synthesis Telescope The Molonglo Observatory Synthesis Telescope (MOST) is a radio telescope operating at 843 MHz. It is operated by the School of Physics of the University of Sydney. The telescope is located in Hoskinstown, near the Molonglo River and Canber ...
. It is 450 m long, 20 m wide, with a second, moveable element (now mostly removed; some of it is still visible, beyond
COAST The coast, also known as the coastline or seashore, is defined as the area where land meets the ocean, or as a line that forms the boundary between the land and the coastline. The Earth has around of coastline. Coasts are important zones in n ...
). The first large aperture synthesis telescope (1958), it was also the first new instrument to be built at Lord's Bridge, after the
Observatory An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysical, oceanography and volcanology are examples of disciplines for which observatories have been constructed. H ...
was moved there in 1957, and needed of reflector wire (since removed). The 4C operated at 178 MHz (1.7 m), and located nearly 5000 sources of the 4C (4th Cambridge) catalogue published in 1965 and 1966, which helped establish the evolution of the radio galaxy population of the universe. The telescope is now inoperable. It is flanked to the northwest by the Cosmic Anisotropy Telescope enclosure and to the south by the One-Mile and Half-Mile Telescopes. Cavendish Laboratory Radio telescopes Interferometric telescopes Astronomical observatories in England {{observatory-stub