The James Webb Space Telescope is the largest optical instrument ever launched into space, and its powerful optics promise to reveal the earliest galaxies to form in the universe. At the heart of the telescope is a 6.5meter diameter primary mirror, which is actually composed of 18 hexagonal segments, each of which is 1.32 meters in diameter. Each of these segments is an aspheric “freeform,” meaning that it is not rotationally symmetric.
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