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Description: Astrophysical Observatory of the Russian Academy of Sciences.
The BTA-6 has a prime mirror diameter of 6 m and is housed in a 48 m diameter dome at an altitude of 2,070 m. Seeing first light in late 1975, it held the record for the largest telescope in the world from its completion until 1993 when it was surpassed by the Keck 1 telescope in Hawaii.
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