The James Webb Space Telescope’s 21.3-foot (6.5 meter) diameter primary mirror. July 26, 2022/by LK Alloys The James Webb Space Telescope’s 21.3-foot (6.5 meter) diameter primary mirror. http://lkalloy.com/wp-content/uploads/2018/10/LKALLOY-LOGO1.png 0 0 LK Alloys http://lkalloy.com/wp-content/uploads/2018/10/LKALLOY-LOGO1.png LK Alloys2022-07-26 08:21:122022-07-26 08:21:24The James Webb Space Telescope's 21.3-foot (6.5 meter) diameter primary mirror.