id: 11200295
Because low-energy gamma rays produce only a small amount of Cherenkov light, telescopes with large collection areas are necessary to detect it. Enter the CTAO's largest instrument: the Large-Sized Telescope (LST). With a mirror 23 meters in diameter and a reflective surface covering 400 square meters, the LST is one of the largest Cherenkov telescopes ever built. On the left side, you can also spot the Gran Telescopio Canarias (GTC), the largest optical telescope in the world, featuring a 10.4-meter diameter mirror.
Getting this close to the telescopes was quite a challenge. We had to bushwhack without turning on our headlamps to avoid disturbing the observations. Hearing these colossal instruments rotate in the dark was an incredible experience. Fortunately, the telescope briefly turned toward us, allowing me to capture this image.
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