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GMT3 measures 25 feet in diameter. Seven of these mirrors will combine to form the primary mirror surface of the world's largest telescope ever built.

GMT in the News x 3

20 Tons of Glass, Fresh from the Oven

The Giant Magellan Telescope’s third primary mirror was unveiled at the University of Arizona, Richard F. Caris Mirror Lab on Friday...

Video: Mirror Lab Unveils Third GMT Mirror

... After spending three months rotating in a custom-built furnace, the mirror is ready for polishing.

Traveling through space with a giant telescope

When completed in 2022, those seven mirrors, each measuring 27 feet across, will give astronomers 10 times the power of the Hubble telescope...

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