The Extremely Large Telescope.
Amazing YouTube video -
it even shows an interferometer combining 4 optical telescopes.
https://www.youtube.com/watch?v=QqRREz0iBes
1,628,075 views Oct 3, 2023
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The Extremely Large Telescope, in Paranal, Chile, is probably going to be the largest optical telescope that will ever be constructed. I was invited out there by the UK Science and Technology Facilities Council and the European Southern Observatory, and I wasn't going to turn down a chance like that.
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cheers
Allan