“Snow Cleaning” Keeps This Giant Telescope Mirror Perfectly Pristine
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.

May 11, 2015 at 10:05AM
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