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Photo credit: National Astronomy and Ionosphere Center

The Arecibo Observatory is the world's largest single-aperture telescope ever constructed. The telescope's dish has a diameter of over 1,000 ft (305m) and covers over 18 acres. The receiver array is suspended 450 ft (150m) above the dish, supported by three concrete towers each measuring between 265 ft (80m) and 365 ft (110m).