Hawaiian officials have given permission for the construction of the Thirty Meter Telescope (TMT) on the 4,200-metre-high Mauna Kea mountain in Hawaii, project leaders announced on 13 April. Building could begin as early as April 2014. Thirteen telescopes already dot the sacred mountain, but the TMT would be the largest; the biggest optical instruments currently on Mauna Kea are the twin 10-metre Keck telescopes. See go.nature.com/ cy6r5s for more.
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