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Under a blanket of snow! 📡🌨️ At the Chajnantor plateau in Chile, temperatures can drop as low as -20°C on winter nights! 🥶 But ALMA Observatory📡 ’s radio antennas are usually unbothered by these chilling conditions 💪 Discover more: eso.org/public/images/… 📷 Sergio Otarola /ESO

Like mushrooms 🍄, telescopes atop ESO’s La Silla Observatory are bathed in the dim light of the sunset. 👈 The Danish 1.54-metre telescope 👉 The 3 BlackGEM Array telescopes Which cosmic signals do they hunt for? Find out: eso.org/public/images/… 📷 ESO/I. Saviane

Astronomers focus on the sky, but it’s worth looking around our planet, too! This image, for instance, was taken from Pukará de Quitor, a fortress built 900+ years ago, not far from ALMA Observatory📡. Discover who built the fortress: eso.org/public/images/… 📷 ESO/ AlbertoGhizziPanizza

Our congratulations to Spanish astrophysicist Itziar de Gregorio-Monsalvo, who became ESO’s new Representative in Chile and is the first woman to lead this office 👏 Discover Itziar's professional journey, following 18 years with ESO & ALMA Observatory📡 eso.org/public/announc…

The skies above Paranal are at risk from a proposed industrial megaproject.  This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations. Read more: eso.org/public/news/es… 📷 ESO/P. Horálek

The pale brown belts of Jupiter? Not made of what was long thought.  Discover the outcome of the joint study of an amateur astronomer with his telescope & scientists with ESO's #VLT! eso.org/public/videos/… 📷 ESO/Irwin et al.

Using ESO's #VLT, astronomers have discovered extremely powerful winds on #exoplanet WASP-127b. The winds reach speeds up to 33 000 km/h, the fastest jetstream of its kind ever measured on a planet! Discover more: eso.org/public/news/es… Artist's impression by ESO/L. Calçada

The 500-kg M5 mirror of the #ELT will be tipped & tilted 10 times per second, to correct atmospheric blurring. This challenging support component is now being tested at ESO's Headquarters in Garching.

Happy International Day of #WomenAndGirlsInScience! To celebrate, our members CERN EMBL European Space Agency ESO European Synchrotron EUROfusion Fusion For Energy European XFEL & Institut Laue-Langevin "passed the phone" to some of their female scientists! #PassThePhoneSTEM #WomenInSTEM

Using ESO's #VLT, astronomers have mapped the 3D structure of an exoplanet's atmosphere for the first time. Never before had this been done in such depth and detail. Discover more: eso.org/public/news/es… Artist's impression by ESO/M. Kornmesser

🚨 2024 YR4 asteroid impact update! After the latest observations conducted with ESO’s VLT & facilities around the world, the odds of the asteroid impacting Earth have dropped to nearly zero. Read more: eso.org/public/news/es…

📷 ESO analysis confirms the INNA project would have a devastating & irreversible impact on the Paranal Observatory facilities. The increase in light pollution, air turbulence, vibrations & dust would degrade conditions for astronomical observations eso.org/public/news/es…

📣 Using ALMA Observatory📡 📡, in which ESO is a partner, astronomers have discovered oxygen in the most distant known galaxy! This record-breaking detection is making scientists rethink how quickly galaxies formed in the early Universe 🤔 Read more: eso.org/public/news/es…

Too large to be made from a single piece, the ELT's 39m main mirror will consist of 798 segments. But how can they work together as one? Enter the edge sensors and actuators, which adjust misalignments among the segments with a precision of just a couple of nanometres 🤯