World’s largest telescope is one step closer to completionan

The GMT project will allow researchers to investigate some of the cosmos' deepest mysteries

Artwork of Giant Magellan Telescope

The world's largest telescope is one step closer to completion after this month, the team working on the Giant Magellan Telescope (GMT) completed the second of seven primary mirror segments - a process that began in January 2012 and is expected to be finally completed by 2028.

The GMT is an international effort to create a telescope that would not only allow astronomers to collect more light than any telescope ever built, but also deliver images 10 times clearer than those produced by the Hubble Space Telescope. When it's up and running, the GMT will help scientists tackle some of the biggest questions, like are we alone in the universe? The powerful scope will also allow astronomers to investigate some of cosmos' other deepest mysteries - the nature of dark matter and dark energy.

But achieving this is no simple task. The team broke ground in 2015, and the telescope isn't expected to be complete until 2027. That's partly because of the complexity of the mirrors. Each primary segment is curved to a precise shape and polished to within a wavelength of light -- about one-millionth of an inch. And thanks to an intricate honeycomb mold, the finished glass is mostly hollow, making it lightweight and easier to cool.

While this second segment took seven years, the University of Arizona was able to significantly speed up the front surface polishing process. The GMT team hopes replicating the technique will help future segments get through production even faster.

Similar articles