Share on X Share on Facebook Share on LinkedIn The installation of the Simons Observatory Large Aperture Telescope's massive primary and secondary mirrors (both roughly 6 meters in diameter) successfully took place at the observatory site in Chile in February 2025. The mirror installation campaign represents a major construction milestone for the project. PHOTO CREDIT: M. Devlin March 20, 2025 The Simons Observatory, located high in the Chilean Andes, has completed the Large Aperture Telescope (LAT), which joins the three Small Aperture Telescopes (SAT) on site. This milestone marks a significant advancement in our understanding of the universe's origins. The observatory's four telescopes will provide unprecedented measurement precision in detecting the oldest light in the universe, helping to uncover what happened just after the inception of the universe. Professors Jo Dunkley, spokesperson and analysis expert, and Suzanne Staggs, co-director of the observatory, emphasize the transformative potential of this research in uncovering the secrets of our cosmic origins and highlight the immense hard work the team put into making this a reality.Read more here. Related People Suzanne T. Staggs Jo Dunkley