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A 3.5-metre (138-inch) reflecting telescope of the European Southern Observatory, located at the La Silla Observatory in Chile. Regular observations with the telescope started in 1990. The name reflects a number of innovative features incorporated in the design. The relatively thin mirror is kept to the required shape by means of an active optics system which analyses the shape of a stellar image and controls the mirror supports about once per second. The altazimuth mount and special enclosure are designed for maximum stability and pointing accuracy, and minimum disturbance of images from air turbulence. The telescope can be operated remotely from ESO's headquarters in Germany via satellite link.
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