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A 37-metre (120-foot) radio dish located at the Haystack Observatory in Massachusetts, north-west of Boston. It is a facility of the Massachusetts Institute of Technology, and the astronomy research is conducted under the auspices of a consortium of thirteen educational establishments. It is equipped for use in the wavelength range 2.6 mm-13 cm; the surface is accurate to half a millimetre. The antenna is fully steerable and of a Cassegrain configuration. Among its discoveries are a number of interstellar molecules. It is also used for very-long-baseline interferometry. When first built in the 1960s, it was used mainly for radar studies of the Moon and nearer planets.
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