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The James Webb Space Telescope's primary mirror is made up of 18 hexagonal segments. Now that the telescope is in space, mission managers need to perfectly align them so the segments work as one giant mirror. NASA/Chris Gunn hide caption

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NASA/Chris Gunn

The James Webb Space Telescope will capture pictures of the very first stars in the universe and help scientists study the atmosphere of planets orbiting stars outside our solar system to see if they might be habitable. NASA/AP hide caption

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