Primary Mirror Segment Cryogenic Testing
Six of the 18 Webb telescope mirrors are readied for shipment. All of the 18 mirror segments will be cryogenically tested twice in the Marshall Center's X-ray & Cryogenic Facility -- once with bare polished beryllium and then again after a thin coating of gold is applied to gain optimal reflectance in the infrared.
Credit: NASA/MSFC/David Higginbotham/Emmett Given
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Taken on July 13, 2010