Overview
- The Cherenkov Telescope Array Observatory finished construction and held a public inauguration for four large telescopes on October 15, 2026, at its La Palma site.
- Each completed telescope has a 23‑metre aperture and stands about 45 metres tall, and they are designed to record faint Cherenkov flashes produced when gamma rays hit Earth’s atmosphere.
- Japan led development of the large‑aperture units as part of an international collaboration of roughly 25 countries that will operate CTAO as a single observatory across La Palma and Paranal.
- Project teams are moving from construction to commissioning with formal multi‑telescope observations targeted around 2027 while work continues to expand toward the planned ~70 telescopes of three sizes.
- Scientists say the array could enable major discoveries about black holes, dark matter and cosmic‑ray origins but stress that those outcomes depend on successful commissioning, sustained funding and the full array coming online.