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 at Sierra Madre Elementary School STEAM night -November 2018-
December 7th, 2018 Education & Outreach

TMT was at the Science, Technology, Engineering, Arts and Mathematics STEAM Night at Sierra Madre Elementary School.

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TMT featured in "Connected" magazine from LEMO
November 26th, 2018 Engineering & Technology

TMT featured in the magazine "Connected" from LEMO, a leader in the design and manufacture of electronic and fibre optic connectors that are used in TMT Primary Mirror Warping Harness System.

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TMT's Scientific Advisory Committee Selects Design for its Second First-Light Workhorse Instrument
November 12th, 2018 Science & Astronomy

The TMT International Observatory Board of Directors recently endorsed the recommendations made by the Science Advisory Committee (SAC), to select a slit-mask-based imaging spectrograph design for WFOS (Wide Field Optical Spectrograph), its second first-light instrument.

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Hawaii Supreme Court Affirms TMT Permit
October 30th, 2018

The Hawaii Supreme Court, by majority decision, today issued its opinion affirming the Board of Land and Natural Resources' decision to issue a Conservation District Use Permit (CDUP) for construction of the Thirty Meter Telescope (TMT) on Maunakea.

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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.