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... he Very Large Telescope (VLT) program. Begun in 1996, it links four 315-in. (8-m) telescopes together with several movable 72-in. (1.8-m) telescopes through optical interferometry, a technique in which the signals from each telescope enhance the signals from the others. Completed in 2003, the combination produces a virtual telescope image equivalent to that of a 630-in. (16-m) conventional reflecting telescope.
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