Engineers in a dark room run a UV light over the surface of a Webb Telescope mirror segment. The light will detect any invisible contaminants, such as stains or oils, on the mirror that could affect the adhesion of the gold coating they are about to apply.

Mirror_coating3_np

Engineers in a dark room run a UV light over the surface of a Webb Telescope mirror segment. The light will detect any invisible contaminants, such as stains or oils, on the mirror that could affect the adhesion of the gold coating they are about to apply.

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