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 and mutual stewardship.

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Read the continuing story about how TMT is the best in the world at what it does.

Maunakea and the Community

Maunakea is a truly unique place and TMT is part of the Hawaiʻi community and firmly believes it is our kuleana (responsibility) to be active supporters of that community.

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.

Latest From TMT

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Seconday mirror design is approved for production readiness
June 27th, 2025 Engineering & Technology

The Thirty Meter Telescope support and positioner assembly for its secondary mirror’s design is now complete

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TIO sends staff to national meetings
June 27th, 2025 Education & Outreach

TIO sends staff to attend the summer national meetings.

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TIO Response to NSF FY 2026 Budget Request to Congress
June 4th, 2025

The Thirty Meter Telescope (TMT) International Observatory is one of the most compelling opportunities for discovery in this generation for the United States to demonstrate global leadership in astronomy, and for partnerships with communities desiring to shape the future jointly.