Cerro Tololo Inter-American Observatory
An observatory in Chile, forming part of the National Optical Astronomy Observatories of the USA. The headquarters are at La Serena, 480 kilometres (300 miles) north of Santiago. The mountain site, 70 kilometres (45 miles) inland is at an altitude of 2,200 metres (7,200 feet). The largest instrument, the 4-metre (160-inch) Victor M. Blanco Telescope, is a twin of that at Kitt Peak in Arizona. Among the six other instruments located at the observatory are 1.5-metre (60-inch), 1.0-metre (39-inch) and 92-centimetre (36-inch) reflectors. A 1.2-metre (47-inch) radio telescope of the Universidad do Chile is also at the site.