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The Giant Magellan Telescope

GMT Summit 2025: Hard rock excavation is complete

GMT Site Map — March 2025

GMT Science BookDescribes the transformative impact that the GMT will have on astrophysics—from exoplanets around neighboring stars to the formation of the first, most distant stars, galaxies, and black holes in the universe. Read more here

Mirror segment 5 after clean outImage credit: Damien Jemison

GMTO engineer Barbara Fischer with prototype mirror cell

July 2025: Mirror segment 2 moved to storageImage credit: Damien Jemison

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SPIE: On Shaky Ground

A new generation of ‘extremely large’ telescopes is being built in earthquake-prone areas. How will engineers protect these massive machines? More...Posted on June 15, 2025

SPIE: Casting Giants

Spun-cast telescope mirrors continue to shape astronomy's future More...Posted on June 12, 2025

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Giant Magellan Telescope signs contract for telescope structure

GMTO has signed a contract with MT Mechatronics and Ingersoll Machine Tools to design, build and install the telescope’s precision steel structure. More...Posted on October 30, 2025

Telescopio Magallanes Gigante firma el contrato para la estructura del telescopio

GMTO ha firmado un contrato con MT Mechatronics y con Ingersoll Machine Tools, para construir e instalar la estructura acero de alta precisión del telescopio. More...Posted on October 30, 2025