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Image Astro du jour
An unusual sight greets Cerro Armazones, in Chile’s Atacama Desert, in this drone image, taken on 19 August 2026. Snow blankets parts of the mountain while low clouds drift around the dome of ESO's Extremely Large Telescope (ELT), glowing in the light of a low Sun.
Cerro Armazones was chosen as the ELT's home for its exceptionally dry conditions, clear skies and rock-steady atmosphere — conditions among the best on Earth for observing the Universe. That's exactly what makes a scene like this so rare: snow and thick clouds briefly turned the usually bare desert into a white landscape, before the mountain's typical dry, cloudless weather quickly returned.
These are extremely infrequent weather events, but even under normal conditions the Atacama Desert is still a harsh environment. To protect the telescope from its surroundings, the ELT sits inside an enormous dome built to shield its most delicate components, including its huge mirrors and scientific instruments, yet to be installed.
Once construction is complete and the ELT achieves first light later this decade, it will use the mountain's exceptional skies to explore the Universe in unprecedented detail, tackling some of astronomy's biggest open questions, from exoplanets to the first galaxies that ever formed.
Links
Full drone video
Other images from this bad weather episode