Casting of GMT's Third Mirror has Begun

On Saturday Aug. 24th, the Stewart Observatory Mirror Lab began casting the third of seven 8.4-meter mirrors that will ultimately comprise the Giant Magellan Telescope (GMT). Upon completion in 2020, the GMT will be one of the largest optical telesocopes on Earth. Together with a technique called adaptive optics, GMT's impressive size will allow it to image the universe with the power of 10 Hubble space telescopes. You can watch a CBS evening news segment here. You can also watch a new video describing the mirror-making process by visiting this NPR website.