Primary Mirror Size Comparison Between Webb and Hubble

  • Released Tuesday, January 14, 2020
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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.


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NASA's Goddard Space Flight Center

Release date

This page was originally published on Tuesday, January 14, 2020.
This page was last updated on Wednesday, May 3, 2023 at 1:45 PM EDT.


This visualization is related to the following missions: