NASA Completes Mirror Polishing for James Webb Space Telescope

  • Released Wednesday, June 29, 2011

Completion of Webb Telescope mirror polishing represents a major mission milestone. All of the mirrors that will fly aboard NASA's James Webb Space Telescope have been polished so the observatory can see objects as far away as the first galaxies in the universe. The mirrors were polished at Tinsley Laboratories Inc. in Richmond, Calif. to accuracies of less than one millionth of an inch. This accuracy is important for forming the sharpest images when the mirrors cool to -400 degrees farenheit (-240 degrees celsius) in the cold of space.


Please give credit for this item to:
NASA/Northrop Grumman/Ball/L3

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This page was originally published on Wednesday, June 29, 2011.
This page was last updated on Wednesday, May 3, 2023 at 1:53 PM EDT.


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  • Webb Telescope Mirror Polishing B-roll (ID: 2011078)
    Wednesday, June 29, 2011 at 4:00AM
    Produced by - Clay Anderson (NASA)