WEBVTT FILE

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(Music)

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Engineers building The James Webb Space Telescope

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recently deployed the revolutionary sunshield.

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The sunshield consists of five layers of a polymer

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material called KAPTON.

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The critical sunshield keeps telescope instruments in deep shadow

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and deep cold, approximately

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394 degrees Fahrenheit below zero.

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Next for Webb: comprehensive

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electrical tests and one more set of mechanical tests

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to emulate launch vibration.

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EXPLORE: Solar system and beyond.

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NASA