Extremely Large Telescope
Videos
The Extremely Large Telescope is an astronomical observatory under construction. When completed, it will be the world's largest optical and mid-infrared extremely large telescope. Part of the European
Artist's impression of the ELT
ESO Council meets at ESO headquarters in Garching bei München, Germany, 2012.
ELT construction status in April 2026
Cerro Armazones at night (2010)
Giant Magellan Telescope
Videos
The Giant Magellan Telescope is a ground-based, extremely large telescope currently under construction at Las Campanas Observatory in Chile's Atacama Desert. With a primary mirror diameter of 25.4 met
Extremely Large Telescope
…Canarias, with a 10.4-metre (34 ft) aperture and a light-collecting area of 74 m2 (800 ft2). Other planned extremely large telescopes include the Giant Magellan Telescope with a mirror diameter of 25 m (82 ft) and area of 368 m2 (3,960 ft2), and the Thirty Meter Telescope with a diameter of 30 m (98 ft), and an area of…
The Giant Magellan Telescope Exterior Illustration
An aerial view of the Giant Magellan Telescope construction site.
Giant Magellan Telescope rendering
Light path on GMT