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Telescopes and space missions

Telescopes and space missions

The ten-billion-dollar gamble: The JWST’s magnificent mirrors

18 Dec 2021

The James Webb Space Telescope (JWST) is scheduled to launch on 25 December. To mark the event, Physics World is publishing a series of blog posts on the telescope’s technological innovations and scientific missions. This post is the second in the series. Read the first here.

Photo of the JWST's primary mirror
Honeycomb: The 18 hexagonal segments of the JWST’s primary mirror, viewed from above in a clean room at NASA’s Goddard Space Flight Center. (Courtesy: NASA/Chris Gunn)
Building a mirror the size of the James Webb Space Telescope’s (JWST) 6.5-metre primary isn’t a

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Keith Cooper is a freelance science journalist and editor
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