Thirty Meter Telescope

Astronomy's Next-Generation Observatory

TMT's Mission and Values

TMT is committed to a community model of astronomy based on the values of respect, inclusion, and mutual stewardship.

TMT's Science and Technology

TMT is an extraordinary international scientific endeavor that will revolutionize our understanding of the universe and our place within it.


Maunakea is a truly unique place.


TMT staff are part of the Hawaiʻi community and TMT firmly believes it is our kuleana (responsibility) to be active supporters of that community.

Latest From TMT

TIO joined the National Science Teaching Association in Denver
March 27th, 2024 Education & Outreach

TMT and all US Extremely Large Telescope Program partners participated in the National Science Teaching Association conference in Denver in March 2024.

5 Nobel Laureates on Building an Extremely Large Telescope
March 20th, 2024

... "As recent U.S. physics Nobel laureates for discoveries in astronomy, we affirm that yes, the United States’ longstanding scientific leadership in astronomy is at risk if the National Science Foundation does not invest in its Extremely Large Telescope Program — and soon."

TMT International Observatory participates in Pasadena Unified School District Science Fest
March 19th, 2024 Education & Outreach

Once again this year, TIO was prepared for an extraordinary scientific adventure at the PUSD Science Fest, hosted at John Muir High School on Saturday 16 March 2024.