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Cleaning the 3.5m mirror of NTT-ESO
That’s an impressive image of how to clean the main, 3.54m diameter, mirror of the New Technology Telescope (NTT) on La Silla. “This very delicate process is performed using a natural sponge, soft soap and distilled water”, as stated at ESO’s site.
Cleaning the 3.5m mirror of NTT-ESO (Credit:ESO)
