Interview on the Webb Mirrors (VIDEO)

NASA/Goddard Space Flight Center

Caption

The James Webb Space Telescope features a mirror 21.3 feet across that consists of 18 separate, hexagon-shaped mirrors. The mirror components are being tested both individually and together. A specially designed vacuum chamber at Marshall Space Flight Center simulates the extreme conditions of spa, subjecting the mirror segments to temperatures as low as 400 degrees below zero.

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webbtelescope.org

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