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Why some astronomers once feared NASA's James Webb Space Telescope would never launch

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The James Webb Space Telescope's primary mirror is illuminated inside a darkened clean room. The entire telescope is now packed inside a rocket, awaiting launch. (NASA Goddard Space Flight Center)
The James Webb Space Telescope's primary mirror is illuminated inside a darkened clean room. The entire telescope is now packed inside a rocket, awaiting launch. (NASA Goddard Space Flight Center)

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