1/ Work is progressing well on the central tower of ESO's Extremely Large Telescope in #Chile 's Atacama Desert. The ELT has a 5-mirror design, and three of them will be housed in the tower you see here. The M4 and M5 mirrors are particularly important to deliver sharp images, as they will counteract atmospheric turbulence and vibrations due to wind or the telescope's mechanisms.
➡️ https://www.eso.org/public/images/potw2448a/?lang
📷 ESO/F. Carrasco (CHEPOX)