For more information about TMT Hawaii, please visit and

Thirty Meter Telescope

Astronomy's Next-Generation Observatory

Explore the latest news, events and announcements from the TMT International Observatory

Screen shot 2020 06 02 at 18.01.26
June 18th, 2020 • Artwork
Rendering of TMT’s Cryogenic Cooling System (CRYO) Envelopes on the telescope Nasmyth P...
Screen shot 2020 06 25 at 16.00.50
June 26th, 2020 • Artwork
TMT Engineering Sensors on the Telescope Structure
June 26th, 2020 • News
TMT Engineering Sensors System Advances to Final Design Phase
June 18th, 2020 • News
TMT Instrumentation Cryogenic Cooling System Moves on to the Final Design Phase
May 28th, 2020 • News
Latest Poll Shows 2-1 Margin in Support of TMT on Maunakea
May 20th, 2020 • News
TMT Donates Masks to the Friends of the Children's Justice Center of East Hawaii
May 14th, 2020 • News
TMT Sponsors $50,000 for Online STEM Learning Program in Hawaii
April 22nd, 2020 • Associate Project Manager Blog
APM Dr Ravinder Bhatia interviews Professor Tommaso Treu
November 1st, 2019 • News
TMT Primary Mirror Segment Support Assembly Integration
April 29th, 2020 • News
TMT’s M1 Metrology Frame in Production
Enclosure 2020 04 06 at 15.58.55
April 23rd, 2020 • Photograph
Cross-section view of TMT Enclosure
April 28th, 2020 • News
Scientists Attend First TMT-GMT Joint Science Advisory Committee Meeting
April 23rd, 2020 • News
TMT Telescope Enclosure Ready for Production
April 22nd, 2020 • Associate Project Manager Blog
Incontra il team TMT: Dr Ravinder Bhatia interviste con Tommaso Treu
April 21st, 2020 • News
The Food Basket Receives $100,000 Donation From TMT To Meet Growing Demand For Food As...
April 13th, 2020 • Associate Project Manager Blog
Visit to LIGO 40 Meter Interferometer
March 23rd, 2020 • News
Testing of TMT’s Primary Mirror Segment in Progress
March 18th, 2020
TMT e-Newsletter March 2020
March 6th, 2020 • News
TMT Reaches Major Milestone with Completion of Fully Populated Mirror Segment Prototype...
20200116 155912
February 6th, 2020 • Photograph
Members Receiving Inspection Team for TMT Mirror blanks delivered at the India TMT Opti...
March 6th, 2020 • News
Installation of TMT mirror segment prototype on the MSIT facility at TMT technical lab ...
February 21st, 2020 • News
TMT Scientific Advisory Committee Holds First Meeting of the New Decade in Pasadena
February 6th, 2020 • News
Successful Receiving Inspection of 18 Mirror Blanks in India
January 27th, 2020 • News
TMT Outreach afternoon at Sierra Madre Elementary School
Tmt pmaohara tmtj okamoto opie2018
February 29th, 2020 • Photograph
Production TMT Primary Mirror Segments in Japan
January 28th, 2020 • News
Eliot Arts Magnet Academy's Science Night
January 24th, 2020 • News
Michael Bolte at #AAS235 January 2020 meeting
Us elt booth aas235 20200107
January 7th, 2020 • Photograph
US ELT Group Picture from AAS 235
M3pdr article illustrations
January 22nd, 2020 • Artwork
Perspectives of TMT M3 System (M3S)
January 22nd, 2020 • News
TMT Tertiary Mirror Passes Preliminary Design Review
January 21st, 2020 • News
Primary Mirror Segment Production has started at Coherent
December 20th, 2019 • News
TMT Observatory Safety System Passes Preliminary Design Review
2019 holidaygreetingscard c
December 20th, 2019 • Artwork
TMT Card 2019
December 18th, 2019 • Press Coverage
Hayashi Saeko: Three Decades Pushing the Limits of Astronomical Observation with the Su...
December 13th, 2019 • News
Amazing Impact of THINK Fund Program on Hawaii Island
December 11th, 2019 • News
First Two TMT Mirror Segment Demonstrators Installed at the Monrovia lab.
November 13th, 2019 • News
TMT Project Engineers at Vertical Laboratories in California test TMT Warping Harness C...
November 15th, 2019 • News
TMT Science Forum 2019 in Xiamen, China
20190918 171434%281%29
October 15th, 2019 • Photograph
Participants of the TMT Common Software Pre-Shipment Review on 18 September 2019, at th...
October 1st, 2019 • News
TMT’s Telescope Control System Passes Preliminary Design Review
July 9th, 2019 • News
Coffee Chat on Mirror Segment Fabrication

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

TMT Engineering Sensors System Advances to Final Design Phase
June 26th, 2020 Engineering & Technology

Recently, the TMT Engineering Sensors System (ESEN) successfully passed its Preliminary Design Review (PDR) and is now ready to enter the Final Design phase. Chris Carter and Scott Michaels, TMT telescope control and software engineers, led a team of four people in presenting the design to the review panel.

TMT Instrumentation Cryogenic Cooling System Moves on to the Final Design Phase
June 18th, 2020 Engineering & Technology

The Thirty Meter Telescope recently reached another critical development milestone with the successful Conceptual Design Review close-out meeting of the Cryogenic Cooling System (CRYO). The online review, held on May 19, 2020, focused on the completion of the recommendations that arose from the CRYO Conceptual Design Review held in August 2018.

Latest Poll Shows 2-1 Margin in Support of TMT on Maunakea
May 28th, 2020 Education & Outreach

The results of a new scientific poll show Hawaii residents continue to support the construction of the Thirty Meter Telescope on Maunakea by a nearly 2-to-1 margin. The public opinion poll conducted in March 2020 by Ward Research, Inc. shows that 61 percent of Hawaii residents support moving ahead with construction of TMT, with 32 percent opposed.

TMT Donates Masks to the Friends of the Children's Justice Center of East Hawaii
May 20th, 2020 Education & Outreach

Helping to mitigate the shortage of protective equipment across the island, TMT staff in Hilo recently sewed and donated 75 reusable cloth face masks to The Friends of the Children’s Justice Center of East Hawaii.

TMT Sponsors $50,000 for Online STEM Learning Program in Hawaii
May 14th, 2020 Education & Outreach

Unfortunately, thousands of students across Hawaii will be out of school for the next several months due to the coronavirus crisis. With parents taking on a larger teaching role to make sure their kids continue to learn and grow while sequestered at home, the Thirty Meter Telescope (TMT) project has awarded a $50,000 grant to the Hilo-based Hawaii Science and Technology Museum to fund its innovative online STEM learning program.