NASA’s James Webb Space Telescope completes primary mirror testChristian Fernsby ▼ | April 15, 2020
Northrop Grumman Space Systems has successfully completed the deployment of the Primary Mirror on NASA’s next-generation space telescope, the James Webb Space Telescope.
NASA James Webb Space Telescope
The Primary Mirror is 21 feet and 4 inches across. The mirror on the James Webb Space Telescope is the largest ever built for NASA. The mirror has a diameter 2.7 times the size of the one on the Hubble Space Telescope.
The reason that the Mirror folds on the telescope is that when deployed, the mirror is too large to fit inside of the 16 foot payload fairing during launch. On the Primary Mirror, there are two “wings,” one on the left and the other on the right. Each wing has to deploy for the telescope to operate properly. ■