Preparing the James Webb Space Telescope (JWST). Engineers clean test mirror with carbon dioxide snow By shooting carbon dioxide snow at the surface, engineers are able to clean large telescope mirrors without scratching them.'The snow-like crystals knock contaminate particulates and molecules off the mirror. Webb will be capturing light from billion light years away. To do this, its mirror must be kept super clean. An optimised version of a NASA image by experienced lead photographer Chris Gunn. Credit: NASA/Chris Gunn. For editorial use only.

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Size: 4550px × 2992px
Location: United States, Maryland, Greenbelt, Goddard Space Flight Center
Photo credit: © NASA / digitaleye / Alamy / Afripics
License: Licensed
Model Released: No

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