Credit: Gemini Observatory Artwork by Lynette Cook
The field of astronomy is entering a new era. In the next two decades, a new class of telescope — known as Extremely Large Telescopes — can be built with capabilities well beyond that of space-based telescopes.
These new telescopes will explore the signatures of life on other worlds, answering fundamental questions about humans' place in the universe: Is there other life out in the vast expanse of space? Are there other worlds with life that future generations can explore?
NSF is considering a potential future investment in the construction and operations of an Extremely Large Telescope in the Northern Hemisphere, the Thirty Meter Telescope.
NSF understands that the possible construction of an Extremely Large Telescope on Maunakea, Hawai‘i Island, Hawaii, is a sensitive issue that requires extensive engagement and understanding of various viewpoints.
NSF will not make a funding decision until after it considers the following:
- Public input.
- The environmental review of the telescope.
- The project's technical readiness.
- The project proponent's management capabilities.
- The availability of federal funding.
- The telescope's alignment with other NSF priorities.
Note: A decision by NSF not to go forward with an investment in the construction and operations of the Thirty Meter Telescope could be made at any time, including before the environmental review process has concluded.
Where is NSF in its environmental review process?
Previously, NSF has:
- Conducted public scoping under the "National Environmental Policy Act" (July 19–September 17, 2022). See Resources for related materials.
- Invited public comment on its draft Community Engagement Plan (July 19–September 17, 2022).
Currently, NSF is:
- Identifying consulting parties to engage with during Section 106 consultation process under the "National Historic Preservation Act."
- Evaluating comments received during the July 19–September 17 scoping comment period and considering how the comments will inform the next steps in the environmental review.
- NSF is continuing to consider how the comments submitted by interested members of the public, agencies and organizations will inform the next steps in the environmental review.
NSF intends to amend the process timeline to accommodate the additional time required to fully review and process public scoping comments; the original timeline that was posted during scoping, shown in meeting materials and in Section 3 of the Draft Community Engagement Plan, is now out of date. NSF will post updates to the process timeline and the Community Engagement Plan to the website once they are available.
If you would like to be notified of additional updates please sign up to our TMT subscriber list.
- See the new Frequently Asked Question: "Would an Action Alternative involving a proposed NSF investment in TMT on Maunakea be subject to the requirements of the Mauna Kea Stewardship and Oversight Authority (established by Hawaii Act 255)?”
January 2023
- NSF is amending the environmental review process timeline to ensure the agency can fully review the large volume of comments it received during the public comment period.
The original timeline posted by NSF during public scoping, shown in Section 3 of the Draft Community Plan, is now out of date. NSF will post updates to this website once they are available.
If you have questions about the process, please contact us at EIS.106.TMT@nsf.gov.
- January 3rd email (PDF, 340.48 KB)
Materials from NSF's public scoping meetings:
NSF hosted a series of public scoping meetings in Hawaii from August 9–12, 2022. All meetings included a presentation followed by a public comment period inviting oral and written comments. Materials shared at those meetings can be found below:
Related links:
- Read the National Academies of Science, Engineering and Medicine's 2020 Astronomy and Astrophysics Decadal Survey.
- Visit the Thirty Meter Telescope project proponent's About page.