The National Science Foundation (NSF) has until September to decide if they will advance the Thirty Meter Telescope to the final design stage. This telescope project is in competition with a similar project in Chile for limited NSF funding. Initially, the NSF had plans to support two “extremely large telescopes” with apertures between 25 and 100 meters: the Thirty Meter Telescope in Maunakea and the Giant Magellan Telescope in Chile. However, the cost of each project has now reached nearly $3 billion.

In February, the National Science Board announced a $1.6 billion cap on the foundation’s investment in extremely large telescopes. NSF Director Sethuraman Panchanathan stated at a May board meeting that the next step is to assemble an expert panel to assess each project. This panel will analyze various aspects such as progress since preliminary design reviews, partnerships, risks and mitigation strategies, government models, scientific complementarity with other telescopes, opportunities for early career scientists, and engagement of the public.

Panchanathan clarified that this panel’s purpose is not to make a decision on constructing a telescope, but to gather critical information to inform the decision-making process on advancing either project to the final design stage. The impact of supporting a project on agency resources during the design, construction, and operation phases will also be considered by the panel. While the panel is still being formed, a report is expected to be submitted to the NSF by the end of September.