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.

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 ...

NASA's Roman Space Telescope is preparing for launch in 2027, with a mission to study distant galaxies and explore dark ...

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 ...