Back to list of articles The installation of the 3.4-metre mirror brings the facility one step closer to its first light, scheduled for 2025. The Vera C. Rubin Observatory's 3.5-meter secondary mirror is the first piece of glass installed on the telescope in its permanent position. Credit: Rubin Observatory/NSF/AURA/F. Munoz Arancibia On July 24, 2024,