Archive for August, 2012

Cleaning the 3.5m mirror of NTT-ESO

Posted August 30, 2012 By grigoris

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.