On a space mirror [as in the James Webb Space Telescope], it would be 2cm [0.75in]. On an EUV mirror, it would be 0.1mm,” he explains. This ultra-smooth mirror surface combined with systems that ...

The first 18 pieces for one of the European Southern Observatory’s Extremely Large Telescope ... will have five mirrors to help further study the cosmos, including our solar system, exoplanets ...

The James Webb Space Telescope achieved a rarity — snapping ... along with the planets and moons in our solar system. - Giant ...