Hawaii
* Pros:
* Mauna Kea is one of the best astronomical sites in the world, with clear skies and low light pollution.
* The existing infrastructure on Mauna Kea could save time and money.
* The University of Hawaii has a strong astronomy program, which could provide support and expertise.
* Cons:
* Mauna Kea is a dormant volcano, and there is a risk of volcanic activity.
* Protests have been held by Native Hawaiians who consider Mauna Kea to be a sacred site.
* The high altitude of Mauna Kea (4,205 meters) can be challenging for some people.
Spain
* Pros:
* The Canary Islands are also known for their clear skies and low light pollution.
* The Spanish government has been supportive of astronomy projects, and there are several existing telescopes on the island of La Palma.
* The lower altitude of La Palma (2,200 meters) would be easier for some people to work at.
* Cons:
* The Canary Islands are located in the Atlantic Ocean, which means that they are further away from many major research institutions.
* The existing infrastructure on La Palma is not as extensive as that on Mauna Kea.
* There is some concern about the potential impact of tourism on the observing conditions in the Canary Islands.
Ultimately, the decision of where to build the next-generation optical telescope will be made based on a number of factors, including scientific merit, cost, and political considerations.
