NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
The 2. Space Telescope primary mirror during the initial grinding phase of its fabrication by the Perkin-Elmer Corporation. Perkin-Elmer optical engineers are shown checking the curvature of the mirror with a spherometer, prior to its final polishing and subsequent coating. The 'eggcrate' structure of the mirror core is emphasised in this view.
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