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CO2 Cleaning


Image credit: NASA/Chris Gunn

CO2 Cleaning

The James Webb Space Telescope is the most powerful space telescope ever built, and its mirrors must be kept squeaky clean. Any debris, even tiny flecks of dust, could impact its science. Ergo, “snow cleaning:” the use of carbon dioxide snow to clean the mirrors thoroughly yet gently. According to NASA, the photo above shows a test mirror getting the snow-clean treatment.

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