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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National Science Foundation Begins Environmental Review Process
July 19th, 2022

The National Science Foundation (NSF) today issued a Notice of Intent to prepare an Environmental Impact Statement (EIS) and to initiate Section 106 consultation for a potential NSF investment in the construction and operation of the Thirty Meter Telescope.

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First TMT Primary Mirror Segment Assembly Successfully Manufactured and Built in India
May 9th, 2022 Engineering & Technology

India-TMT and industry partners Larsen and Toubro (L&T) successfully manufactured and assembled the first TMT Segment Support Assembly (SSA) in L&T Coimbatore facility. Hard work paid off and India-TMT successfully passed an Assembly Readiness Review a few weeks ago, presenting their first and recently assembled TMT SSA, including all separate compliant components, which are about 450 precision parts.

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TMT Helps Students Reach for the Stars at Altadena Eliot Science Fest
May 2nd, 2022 Education & Outreach

As part of its ongoing outreach and educational activities, TMT participated in the annual Science Festival of Eliot Arts Magnet School on Saturday, April 23rd. The event provided a unique opportunity to learn about science, technology, engineering, robotics, health, and environmental activities taking place in Pasadena.