Here are presented the pictures of one of the largest telescopes in the world - BTA. Big Alt-azimuth telescope mirror- 6m. the weight of a mirror - 42t. the weight of the telescope-850t. the weight of its rotating part-650t. the weight of the dome towers 1000 tons.! built in the 70s of the last century and for a long time held the position of the largest telescope in the world. done so accurately that is capable of focusing light to a point, which is smaller than the diameter of a human hair.
Sent by Alexander P.
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