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ESOcast 176 Light: Building the Biggest Optical Telescope in the World (4K UHD)
Posted 10 September 2018, 11:30
Construction is underway at Cerro Armazones -- the future home of the Extremely Large Telescope (ELT). When construction is done the ELT will be the largest optical telescope​ ever built -- a dome the size of a cathedral.

ESOcast 145 Light: First ELT Main Mirror Segments Successfully Cast (4K UHD)
Posted 9 January 2018, 13:00
The first hexagonal segments for the main mirror of ESO’s Extremely Large Telescope (ELT) have been successfully cast by the German company SCHOTT at their facility in Mainz. These segments will form parts of the ELT’s 39-metre main mirror, which will have 798 segments in total when completed. The ELT will be the largest optical telescope in the world when it sees first light in 2024.

ESOcast 108 Light: First Stone Ceremony for ESO's ELT (4K UHD)
Posted 26 May 2017, 23:30
The first stone ceremony for ESO’s Extremely Large Telescope​ has taken place at the Paranal Observatory in northern Chile, in the presence of the President of Chile.

ESOcast 84: The New E-ELT Design Unveiled
Posted 25 May 2016, 15:00
ESO has awarded the biggest contract in ground-based astronomy — to build the E-ELT dome and telescope structure. So it’s a good time to take a look at what the E-ELT will be.

ESOcast 70: Green Light for E-ELT Construction
Posted 4 December 2014, 12:00
The European Extremely Large Telescope, or E-ELT for short, will be by far the largest optical and near-infrared telescope in the world. In early December 2014 the ESO Council gave the go-ahead for the first construction phase of the telescope.

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