casting & polishing, and other critical operational technicalities have been worked through or are currently being worked on. No specific timelines or schedules have been provided in regards to expected start/completion dates of additional construction at this time. See also European Extremely Large Telescope Very Large Telescope Giant Magellan Telescope List of largest optical reflecting telescopes References External links Mauna Kea page at the Hawai'i Department of Land and Natural Resources INSIGHTS ON PBS HAWAII Should the Thirty Meter Telescope Be Built? (air-date video; April 30, 2015) Astronomical observatories in Hawaii Telescopes Telescopes under construction