Proton collisions at the LHC end on a high(-luminosity) note 💫 During this year, an exceptional volume of data was collected at a collision energy of 13.6 teraelectronvolts (TeV). Watch to find out more about what this means. 👇

What if we were made of #DarkMatter? In today’s #ThrowbackThursday, theoretical physicist Djuna Croon explores the difference between dark matter and ordinary matter, highlighting the role of dark matter in the formation of our existence.

Biodiversity project takes flight 🪁 The “Ambient” initiative is using artificial intelligence to identify birdsong on the CERN sites and monitor biodiversity. Find out more: home.cern/news/news/ce...

‘Tis the season for #DarkMatter 🎃 Today’s #PhotoOfTheWeek highlights Halloween Jack-o'-lanterns in the ATLAS Control Room. One pumpkin features a schematic of the @atlasexperiment.bsky.social, and the other a dark-matter candidate event display.

🚀 From particle physics to medical applications  Join the CERN Accelerator School course on Medical Accelerators and learn more about how particle accelerators are used in hospitals every day. #CAS2026 📍Jurmala, Latvia 📆 15 – 26 June 2026 📌Deadline: 13 April 2026 🙋Registration: cas.web.cern.ch

First observation of single top quark production with W and Z bosons This incredibly rare phenomenon, observed at the @cmsexperiment.bsky.social, can help probe the fundamental forces of nature. Find out more: home.cern/news/news/ph...

Can you guess any of these experiments and what they all have in common? Hint: they do some heavy detective work😉 Here we see parts of nine CERN experiments that hunt for #DarkMatter by studying different physics.

Ion recycling to illuminate the heaviest elements A sophisticated electrostatic trap at CERN’s ISOLDE facility could help researchers probe the chemical reactivity of the rarest and least understood elements. Find out more: home.cern/news/news/ph... Image by the MIRACLS collaboration

🎤 Are you passionate about science? Show us! 😉 To mark the 20th anniversary of FameLab International, CERN is teaming up with FameLab to invite you to share your love for science and win fantastic prizes.

You searched, we answered (#CERNLibrary Edition) 🗣️ In celebration of #DarkMatterDay, we invited Kyungmin from the @cmsexperiment.bsky.social to address some of the web’s most searched questions about #DarkMatter.

POV: Preparing to investigate the mysteries of #DarkMatter 🌌 In honour of #DarkMatterDay, we accompanied Baptiste, an @atlasexperiment.bsky.social physicist studying dark matter, as he gears up for his day of detective work.

#ThrowbackThursday to 1970 when scientists were measuring the magnets for the Intersecting Storage Rings (ISR) – the world’s first hadron collider. The ISR started operations on 27 January 1971, when two beams of protons collided for the very first time.

Today, CERN’s #PhotoOfTheWeek showcases a series of images captured by Marc Goodwin during the 2025 CERN Photowalk competition, held earlier this summer. #PhysPics25 Marc Goodwin was awarded the 1st prize in this year’s Photowalk by a local jury for the first picture.

Here we see the recent delivery of three huge compressors (Image 1), key components of the cryogenics system that will cool the new High-Luminosity Large Hadron Collider.

✨ Content. Clarity. Charisma. ✨ Who will have what it takes to win? Join us on 25 November at #CERNScienceGateway for the FameLab International final.

Molecules of pear-shaped atomic nuclei bear fruit 🍐 A new ISOLDE study of molecules containing pear-shaped atomic nuclei helps shape future research aimed at testing fundamental symmetries of nature Find out more: home.cern/news/news/ph...

Gearing up for higher-luminosity 💫 Yesterday, the Large Hadron Collider hit a new record – 500 inverse femtobarns (fb-1), equivalent to 50 million billion collisions, delivered to the @atlasexperiment.bsky.social and @cmsexperiment.bsky.social since it began operations in 2010.

The first computer at CERN 🖥️ #ThrowbackThursday to 1967, featuring the Control Data 6600 (CDC6600), the first computer at CERN and the most powerful of its era.

CERN welcomes Ireland as an Associate Member State Read more: home.cern/news/news/ce...

Today, CERN’s #PhotoOfTheWeek highlights a series of images captured by Clemens Sill during the 2025 CERN Photowalk competition, held earlier this summer. #PhysPics25

Intensity is on the rise at the #LHC 💫 The Large Hadron Collider propelled particle bunches containing more than 230 billion protons (2.3 x 10^11): 40% more than usual. These bunches generated an average of 150 collisions, compared to around 65 collisions during normal operations.

Here we see the UltraLight Cold Plate (UCP) technology. This was developed at CERN for the thermal management of sensors and chips in the new Inner Tracking System (ITS).

Curiosity drives discovery!🌌 The ATLAS Experiment @cern.bsky.social brings together thousands of scientists and engineers from around the world to explore the building blocks of the Universe. 🎥 Watch our new introductory video, available in 6 languages on YouTube. www.youtube.com/watch?v=6UqW...

Autumn at CERN, back in the day 🍂 As the leaves start deserting the trees, today we #ThrowbackThursday to the 90s with some autumnal scenes across CERN’s sites in Meyrin (Switzerland) and Prévessin (France).

The hidden spots 💫 Today, CERN’s #PhotoOfTheWeek features a collection of images taken by Alice Mangoyan during the 2025 CERN Photowalk competition, held earlier this summer. #PhysPics25

This is the ACCURATE 2A application-specific integrated circuit (ASIC) – a specialised device that excels in ultra-low current measurements. At CERN, the ASIC is used as a front-end sensor interface in ionisation chambers for radiation monitoring.

Congrats to Congqiao Li, Christina Wenlu Wang, & Ho Fung Tsoi for rising above a pool of 19 nominees with their exceptional research and winning the 2024 CMS PhD Thesis Award! 🏆 🔗Find out more, including a video of the winners answering questions: cms.cern/news/cms-phd...

In case you missed it, here’s an overview of the 2025 European Physical Society Conference on High Energy Physics, which took place this summer in Marseille, France. #EPSHEP2025 @cnrs-in2p3.bsky.social @epshep2025.bsky.social

#ThrowbackThurdsday to 1973 💫 Here we see the cleaning of vacuum chambers for the Super Proton Synchrotron, the second-largest machine in CERN’s accelerator complex. Today, it serves as an acceleration stepping stone between the Proton Synchrotron and the #LHC.

CERN's Chips: Transforming Science and Society From pioneering colour X-rays to uncovering art forgeries, semiconductor chips - initially developed for particle physics experiments - are making remarkable societal impacts. Discover how CERN’s Medipix collaborations are driving these innovations.

Happy anniversary #CERNScienceGateway 💫 Today, CERN’s #PhotoOfTheWeek features our science center for education and outreach, which was inaugurated and open to the public two years ago.

Day in the life of a #BL4S student 💫 Follow Maxime – one of the 2025 Beamline for Schools winners – as he takes us along for a day #AtCERN. 👇

📣 ‘Tis the season for public events #AtCERN CERN invites you to join our upcoming events this November. #GenerationHiggs If you're in the Geneva (Switzerland) area, enjoy a rich cultural programme featuring music, science talks, and more. Explore the full program: visit.cern/events

Here we see a Single-frequency Raman Laser. This ultra-compact optical system, based on Raman laser conversion, is leveraging the unique properties of diamonds for high-power laser output with an ultra-narrow linewidth.

Why engage youth in science? 🧑‍🎓 Hear from the directors and special guests – #CERN Director-General Fabiola Gianotti, architect Renzo Piano, and John Elkann, President of Fondazione Agnelli – on why it is important to get the young generation interested in science.

White Rabbit meets quantum entanglement 🐇⚛️ The CERN-born open-source timing technology is being tested for its potential in quantum networks and secure quantum communication Find out more: home.cern/news/news/co...

#ThrowbackThursday to 1973 at the opening of the tunnel linking Laboratory I and Laboratory II. #DidYouKnow that CERN’s campus spreads over two countries? The tunnel connected CERN’s Main Site in Switzerland (Laboratory I), to the site in France (Laboratory II) to ensure a fast connection.

It’s a wrap for #BL4S 2025 💫 From 10 to 24 September, CERN, DESY and the University of Bonn welcomed the winners of the 2025 Beamline for Schools (BL4S) competition. Find out more: home.cern/news/news/ce...

This #PhotoOfTheWeek features the highlights of last week’s public event hosted at #CERNScienceGateway. 🎬 On 25 September, CERN hosted an exclusive preview screening of the documentary “Les vrais chercheurs ne savent pas ce qu’ils cherchent…”.

#PassThePhone challenge with our #BL4S students 📞 Last week, CERN, DESY and the University of Bonn welcomed the winners of the 2025 Beamline for Schools competition. Hear from Defne, Alex and Leo about what they are working on during their time in the labs.

Open call: Resonance Geneva-based artists and collectives are invited to submit proposals for a fully funded, two-month residency at CERN. The selected artist will expand their practice and develop new work in dialogue with CERN’s scientific community. Deadline: 3 November 2025

Preserving particle physics data 📊 A lot of the science from our accelerators is published long after collisions end, so storing experimental data for future physicists is crucial. Find out more: home.cern/news/news/ex...

Happy 71st anniversary CERN 🎉 #OnThisDay 71 years ago, twelve European countries came together to establish what has become the world’s largest #ParticlePhysics laboratory, home to the #LHC, birthplace of the World Wide Web and where the #HiggsBoson was discovered thirteen years ago.

Here we see engineers manoeuvring one of the new “Target Absorber Secondary” modules (TAXS) in a recently-completed model of the region where it will be installed. The TAXS modules are effectively very large blocks of copper to absorb secondary particles created by particle collisions.

🤩 We’re about to go LIVE from the CMS experimental site! Click here to join the tour and ask any questions you'd like our scientists to answer 👉 www.youtube.com/live/7CL6qoN...

CERN and society 🤝 Created in 2014, the CERN & Society Foundation (CSF) supports and promotes CERN’s mission and its benefits to the wider public – nationally and internationally – across three main areas: education and outreach, innovation and knowledge exchange, and culture and creativity.

Celebrate European Researchers’ Night with us THIS FRIDAY by taking part in our virtual visit, live from the CMS experiment site at CERN! And don't forget - your guides will be two CMS scientists who can answer any of your questions! 👉Register here: indico.cern.ch/event/159198...

Searching for new physics with beauty particles ✨ A new @lhcb.bsky.social analysis confirms a previously observed tension with the #StandardModel, but more data and improved theoretical calculations are needed to determine whether new physics is at play. Find out more: home.cern/news/news/ph...

In this back-to-school season, we #ThrowbackThursday to the 1970s, with various workshops held #AtCERN. To this day, CERN has a Main Workshop, which provides the necessary mechanical components and materials for #ParticlePhysics experiments.

Join us tomorrow at 19:00 CEST for the exclusive preview screening of the documentary “Les vrais chercheurs ne savent pas ce qu’ils cherchent…” – “Real researchers don’t know what they’re looking for”. Register here: indico.cern.ch/event/1577730/