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Image Astro du jour
Today's Picture of the Week shows ESO's Extremely Large Telescope (ELT), glowing in the sunset light of the Chilean Atacama Desert and surrounded by massive cranes hard at work to get this telescope up and running. As of April 2026, when this image was taken, the ELT is over 70% complete.
This soon-to-be telescope is located at the top of Cerro Armazones, the mountain that casts a triangular shadow in the background of this drone image. At 3046 metres above sea level, and with very dry conditions, the ELT is in the perfect location for astronomical observations under one of the most pristine skies on Earth. Its dome, planned to be fully completed in 2027, protects the telescope and its sensitive components from the extreme desert environment, and from the Sun during daytime. At night, its two massive sliding doors will open to allow the telescope to observe the night sky, while still protecting it from the wind.
Inside the dome, the construction of the main structure of what will be the world's largest optical and near-infrared telescope is very advanced. With the first light planned for the end of the decade, the ELT and its groundbreaking 39-metre main mirror will take on some of the biggest challenges in astronomy and, ultimately, help us understand our place in the Universe.
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A bird’s eye view of the ELT