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Space

Science

Kenna Hughes-Castleberry

Polishing a telescope mirror to perfection | Space photo of the day for Oct. 6, 2025

A man wearing a white jumpsuit and hair net and white gloves lays on a glass mirror and polishes it.

Night after night in the dry air of Chile's Atacama Desert, fine dust and pollutants settle on the aluminum coating of the mirrors belonging to the Very Large Telescope, part of the European Southern Observatory (ESO). This process degrades the mirrors' reflectivity and clarity over time, so technicians regularly recoat and polish them to ensure the best precision.

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