First light: ELT 2025 (39.3m, 978m²) TMT 2027 (30m, 655m²) (Future first-light dates are provisional and likely to change. https://en.wikipedia.org/wiki/Extr

First light: ELT 2025 (39.3m, 978m²) TMT 2027 (30m, 655m²) (Future first-light dates are provisional and likely to change. https://en.wikipedia.org/wiki/Extremely_Large_Telescope https://en.wikipedia.org/wiki/Extremely_Large_Telescope) Nice mirror size comparison: https://en.wikipedia.org/wiki/Extremely_Large_Telescope#/media/File:Comparison_optical_telescope_primary_mirrors.svg https://en.wikipedia.org/wiki/Extremely_Large_Telescope#/med...