Thirty Meter Telescope

Astronomy's Next-Generation Observatory
What is TMT?

The Thirty Meter Telescope is a new class of extremely large telescopes that will allow us to see deeper into space and observe cosmic objects with unprecedented sensitivity.

What will TMT Explore?

TMT will be a unique tool for probing many outstanding open questions in astronomy.

Who is building TMT?

The Thirty Meter Telescope is being designed and developed by the TMT International Observatory LLC (TIO).

Our Story So Far...

The Board of the Thirty Meter Telescope selected Maunakea in July 2009 after a rigorous five-year campaign spanning the entire globe that measured virtually every atmospheric feature that might affect the performance of the telescope.

Latest From TMT

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TMT Adaptive Secondary Mirror Passes Conceptual Design
October 18th, 2018 Engineering & Technology

Pasadena, CA - Sept. 25, 2018 – The TMT Project Office recently held a conceptual design review to evaluate the design study for the TMT’s Adaptive Secondary Mirror (AM2) system.

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TMT Executive Software Successfully Passes First Phase of Preliminary Design Review
October 11th, 2018 Engineering & Technology

Pasadena, 5 October, 2018 - The TMT Observatory Executive Software (ESW) has passed a key milestone and is now ready to enter final design phase. An ESW Preliminary Design Review phase1 (PDR1) was held at the project office on September 27, 2018. ThoughtWorks, ITCC and TMT Engineers presented the overall Executive Software architecture and operations concepts, as well as their updated requirements and technical use cases.

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W. M. Keck Observatory Awarded NSF Grant To Develop Next-Generation Adaptive Optics System
October 4th, 2018 Science & Astronomy

“This revolutionary system will significantly expand Keck Observatory’s scientific reach,” said Co-Principal Investigator Andrea Ghez, director of the UCLA Galactic Center Group. “KAPA will also serve as an intellectual springboard for the coming generation of extremely large telescopes. We are developing KAPA in partnership with the Thirty Meter Telescope, Giant Magellan Telescope, and European Extremely Large Telescope (ELT) so they can be...

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TMT Camp Laniakea
September 17th, 2018 Education & Outreach

Fun and learning at TMT Camp for Puna Keikis

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The TMT Primary Mirror System Successfully Passes Final Design Review
September 10th, 2018 Engineering & Technology

PASADENA (July 26-27, 2018)– The Thirty Meter Telescope Optics Group recently achieved a critical milestone by passing its Primary Mirror Optics System (M1S) final design review. The review board, comprised of international reviewers and observers from various institutions including ESO, ITCC, JPL, JWST/Ball Aerospace, KECK, NAOJ, NIAOT, and the TMTPO*, met at TMT headquarters in Pasadena.