![]() Offices were located on the University of Arizona campus. Virgin Islands, and eight other sites across the continental United States. The ten VLBA telescopes are in Hawaii, the U.S. Located on the New Mexico Tech university campus, the AOC serves as the headquarters for the Very Large Array (VLA), which was the setting for the 1997 movie Contact, and is also the control center for the Very Long Baseline Array (VLBA). The NRAO's facility in Socorro is the Pete Domenici Array Operations Center (AOC). Socorro, New Mexico The Very Large Array (VLA), an array of 27 dish antennas Byrd would pioneer a campaign in Congress to replace it with the Green Bank Telescope, construction for which began in 1990. The debris from the collapse was cleared by June 1989, and West Virginia Senator Robert C. A cascade failure of the structure occurred at 9:43pm causing the entire telescope to implode. The collapse in 1988 was found to be due to unanticipated stresses which cracked a hidden, yet weight and stress-supporting steel connector plate, in the support structure of the massive telescope. The telescope stood at 240ft in height, wieghed 600-tons, had a 2-min arc accuracy, and had a surface accuracy of ~1 inch. Two major overhauls installed a new surface in 1970 to correct for maintenance, snow damage, and warping from its sheer size then a new, bigger project-building was constructed in 1972 that incorporated a Farady-cage around the control room itself. The telescope's first observation was of the remnants of Tycho's supernova that had exploded 11th November, 1572. It was the largest radio telescope on Earth when it was brought online for its first observation at 12:42am on September 21st, 1962. Until its collapse on November 15th, 1988, a 300ft radio telescope stood at the Green Bank Observatory's unique site. The 300-foot telescope after collapsing on November 15th, 1988 All vehicles on the premises are powered by diesel motors to minimize interference by ignition systems. Electric fences, electric blankets, faulty automobile electronics, and other radio wave emitters have caused great trouble for the astronomers in Green Bank. At one point, the observatory faced the problem of North American flying squirrels tagged with United States Fish and Wildlife Service telemetry transmitters. To aid in limiting outside interference, the area surrounding the Green Bank Observatory was at one time planted with pines characterized by needles of a certain length to block electromagnetic interference at the wavelengths used by the observatory. With the advent of wireless technology and microprocessors in everything from cameras to cars, it is difficult to keep the sites free of radio interference. All other fixed radio transmitters including TV and radio towers inside the zone are required to transmit such that interference at the antennas is minimized by methods including limited power and using highly directional antennas. No fixed radio transmitters are allowed within the area closest to the telescope. The land was set aside by the Federal Communications Commission in 1958. The zone consists of a 13,000-square-mile (34,000 km 2) piece of land where fixed transmitters must coordinate their emissions before a license is granted. Green Bank is in the National Radio Quiet Zone, which is coordinated by NRAO for protection of the Green Bank site as well as the Sugar Grove Station monitoring site operated by the NSA. The observatory contains several other telescopes, among them the 140-foot (43 m) telescope that utilizes an equatorial mount uncommon for radio telescopes, three 85-foot (26 m) telescopes forming the Green Bank Interferometer, a 40-foot (12 m) telescope used by school groups and organizations for small scale research, a fixed radio " horn" built to observe the radio source Cassiopeia A, as well as a reproduction of the original antenna built by Karl Jansky while he worked for Bell Labs to detect the interference that was discovered to be previously unknown natural radio waves emitted by the universe. Byrd Green Bank Telescope, which stands near Green Bank, West Virginia. NRAO was, until October 2016, the operator of the world's largest fully steerable radio telescope, the Robert C. Green Bank, West Virginia The 100-meter Green Bank Telescope ![]() The North American ALMA Science Center and the NRAO Technology Center and Central Development Laboratory are also in Charlottesville. The NRAO headquarters is located on the campus of the University of Virginia in Charlottesville, Virginia. NRAO designs, builds, and operates its own high-sensitivity radio telescopes for use by scientists around the world. The National Radio Astronomy Observatory ( NRAO) is a federally funded research and development center of the United States National Science Foundation operated under cooperative agreement by Associated Universities, Inc. ![]()
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