The Thirty Meter Telescope (TMT) is a planned extremely large telescope (ELT) that has become controversial due to its location on Mauna Kea, on the island of Hawaiʻi. The TMT would become the largest visible-light telescope on Mauna Kea. Scientists have been considering ELTs since the mid 1980s. In 2000, astronomers considered the possibility of a telescope with a light-gathering mirror larger than 20 meters (65') in diameter, using either small segments that create one large mirror, or a grouping of larger 8-meter (26') mirrors working as one unit. The US National Academy of Sciences recommended a 30-meter (100') telescope be the focus of U.S. interests, seeking to see it built within the decade. More information...
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