Broken Records

Largest mirror in space

The current largest mirror in space record is 21′ 3.9″, held by James Webb Space Telescope, set on December 25, 2021. Last checked October 14, 2026.

21′ 3.9″

James Webb Space Telescope

Sun-Earth L2, 1.5 million km from Earth, 2021

Holder
James Webb Space Telescope
Record
21′ 3.9″
Metric
6.5 m
Exact figure
6.5 m gold-coated beryllium mirror (18 segments)
Location
Sun-Earth L2, 1.5 million km from Earth
Date set
December 25, 2021
Recognized by
NASA, ESA, CSA
Last checked
October 14, 2026

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