Primary Mirror Size Comparison Between Webb and Hubble

  • Released Tuesday, January 14th, 2020
  • Updated Wednesday, May 3rd, 2023 at 1:45PM
  • ID: 13521

The James Webb Space Telescope primary mirror is 6.5 meters (21 feet 4-inches) across. The Hubble Space Telescope primary mirror is 2.4 meters (8-feet) across.

The Webb Telescope's longest segment is its sunshield at 21.18 meters (69.5 feet) long. The Hubble Space Telescope is 13.2 meters (43.5 feet) long.


Please give credit for this item to:
NASA's Goddard Space Flight Center


This visualization is related to the following missions: