Here are pictures of one of the largest telescopes in the world - BTA. Big Alt-azimuth telescope mirrors-6m. weight mirrors - 42t. weight of the telescope-850t. the weight of its superstructure-650t. weight of the dome towers 1000 tones.! built in the 70-ies of the last century and a very long time held the position of the largest telescope in the world. done so accurately, that can focus light to a point, whose diameter is smaller than a human hair.
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