Thirty Meter Telescope

Astronomy's Next-Generation Observatory

What is TMT?

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

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 ...

In 2009, the Thirty Meter Telescope International Observatory (TIO) selected Maunakea, on Hawaiʻi Island, as the preferred site to build and operate TMT after a rigorous five-year campaign that spanned the globe.

Latest From TMT

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TMT Segment Mount Undergoes Tests in the Netherlands
November 17th, 2022 Engineering & Technology

A few months ago, TMT Optical engineers traveled to the Netherlands to support the Dutch company TNO install a TMT Segment Support Assembly (SSA) onto an SSA Module Acceptance Test Tool (SMATT). This is an important step in the design and construction of the M1 optics system, a 492-segment primary mirror for the TMT. 

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TMT Promotes Science at UCLA’s “Exploring Your Universe 2022”
November 16th, 2022 Education & Outreach

The University of California, Los Angeles (UCLA) presented its first in-person Exploring Your Universe (EYU) science fair in three years on November 6, 2022. About 12,000 visitors of all ages and backgrounds came to UCLA from the greater LA community.

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2022 AstroDay West Hawaiʻi
November 10th, 2022 Community Engagement

AstroDay 2022, led by the University of Hawai‘i’s Institute for Astronomy (IfA), is dedicated to sharing the amazing science of astronomy and the incredible discoveries made by telescopes throughout the state of Hawaiʻi. The IfA brought together the Maunakea Observatories and various other organizations for a fun filled day engaging ʻohana in Kailua-Kona.