The Thirty Meter Telescope (TMT) is a planned, eighteen story, astronomical observatory and extremely large telescope to be built on the summit of Mauna Kea in the state of Hawaii. The TMT is designed for near-ultraviolet to mid-infrared (0.31 to 28 μm wavelengths) observations, featuring adaptive optics to assist in correcting image blur. The TMT will be at the highest altitude of all the proposed ELTs. The telescope has government-level support from several R&D spending nations: China, Japan, Canada and India.