A little over four times the diameter of the James Webb Space Telescope. According to the website, the mirrors are cast at the University of Arizona mirror lab and take four years each to make.

The James Webb Telescope's gold mirrors aren’t just for looks—they’re a scientific marvel. Gold reflects up to 99% of ...

Telescope mirrors are sensitive and prone to damage ... And if you happen to have some left over, it can be used to help make your own windshield wiper fluid, too. Want the latest in tech and ...

PE was only going to make one mirror and after NASA requested a backup ... Some experiments could use the telescope the way it was, but others were impossible. So for three years, the telescope ...

The Webb telescope — a scientific collaboration between NASA, ESA, and the Canadian Space Agency — is designed to peer into ...

It was actually flat-packed up against the main mirror, with one of its three booms given a hinge joint to make sure everything was tucked in tight. Controllers at the Space Telescope Science ...

Making the far near The invention ... This was the first working reflecting telescope. Other designers proved unable to grind mirrors with a regular curvature, so the reflector remained largely ...