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Telescopes and space missions

Telescopes and space missions

The ten-billion-dollar gamble: How the JWST will see deep into the universe’s past

22 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 sixth in the series. Read the first here.

Image showing hundreds of remote galaxies
Even more eXtreme: The Hubble Space Telescope’s eXtreme Deep Field saw galaxies as they were 13.2 billion years ago, at redshifts up to 12. The JWST should see galaxies as far back as 13.5 billion years, possible up to redshifts of 25 to 30. (Courtesy: NASA; ESA; G Illingworth, D Magee, and P Oesch/University of California Santa Cruz; R Bouwens/Leiden University; and the HUDF09 Team)
One of the James Webb Space Telescope’s (JWST’s) scientific tasks will be to revisit the so-call

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Keith Cooper is a freelance science journalist and editor
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