Today, CERN welcomed @vdombrovskis.bsky.social, European Commissioner for Economy and Productivity, Implementation and Simplification, for a tour of the Laboratory.

#ThrowbackThursday to 1970 ⛄ Here we see the delivery of foggy liquid nitrogen in snowy weather. CERN's cryogenic systems cool over 1000 magnets on the Large Hadron Collider (#LHC) to temperatures close to absolute zero. Find out more: www.home.cern/science/engi...

What does a research fellow actually do #AtCERN? 🤔 Meet Mia, a research fellow in the Systems department, contributing to ISOLDE, where scientists study the properties of atomic nuclei, with further applications in fundamental studies, astrophysics, and material and life sciences. #WomenInScience

Today, CERN’s #PhotoOfTheWeek features a series of images captured by Corinne Longhi during the 2025 CERN Photowalk competition. #PhysPics25 📸 by Corinne Longhi

The Jan/Feb 2026 issue of the #CERNCourier is out 🚀

Did you know CERN also welcomes biomedical engineers? 🤔 Meet Francesca, biomedical engineer and PhD student #AtCERN, who works in the robotics team of the Beams department. #WomenInScience #WomenInScience2026 #WiS2026 #IDWGS

Here we see a team of surveyors from the European Spallation Source ERIC (ESS) taking precise measurements of a silicon carbide girder prototype at CERN.

Groundbreaking calorimeter for the #HiLumiLHC The @cmsexperiment.bsky.social has recently completed the first prototype slice of its innovative High-Granularity Calorimeter (HGCAL), which will be the largest silicon-based detector ever built. Read more: home.cern/news/news/ex...

Heating homes with the world’s largest particle accelerator Now operational, a new heat exchange system is reusing hot water from part of the Large Hadron Collider’s cooling system to heat homes and businesses in the local area. Read more: home.cern/news/news/ce...

#ThrowbackThursday to January 1963 ⛄ With stalactites of ice on roofs, white parking lots and snowy gardens, CERN’s main site in Meyrin, Switzerland turned into a true winter wonderland that year. Are you spending this winter surrounded by snow?

Around the Lab 💫 Today, CERN’s #PhotoOfTheWeek features a series of images captured by Gregory Milasseau during the 2025 CERN Photowalk competition. #PhysPics25 👉 Vote now and help select the global winners: www.interactions.org/photowalk-vo... 📸 by @gregseth

European labs get aligned at CERN Eleven laboratories came to CERN to measure the same object using their state-of-the-art equipment, in order to establish a common definition of alignment uncertainty in their measurements.

Last week we asked you to guess what this was… 🔎 Here we see the Experimental Linac for Surface Analysis (ELISA), a compact proton accelerator built for exhibition in #CERNScienceGateway – the only one that is ready for demonstrations to the public.

Exploring asteroids with particle beams CERN’s #HiRadMat facility is enabling scientists to delve into the behaviour of asteroid materials under extreme conditions.

Can you guess what this is? Hint: it’s located at #CERNScienceGateway. We’ll share the answer on Monday.

#ThrowbackThursday to February 1963 🔎 Here we see CERN’s “scanning people” using the IEP apparatus to scan and measure track-chamber photographs. From the 1960s to the 1980s, the Laboratory relied on these experts to visually inspect enormous quantities of film produced by particle detectors.

Today, CERN’s #PhotoOfTheWeek features a series of images captured by Matteo Monzali during the 2025 CERN Photowalk competition. #PhysPics25 👉 Vote now and help select the global winners: www.interactions.org/photowalk-vo... Which picture is your favourite? 😉

What can you do with 380 million #Higgs bosons? What is the fate of the universe? Why is there more matter than #antimatter? What lurks beyond the #StandardModel? Valentina Cairo & Steven Lowette explore the physics reach of the High-Luminosity LHC (#HiLumiLHC) in the new issue of the #CERNCourier.

The CMS Barrel Timing Layer (BTL) is a crucial component of the @cmsexperiment.bsky.social detector upgrade for the #HiLumiLHC – the successor to CERN’s Large Hadron Collider. Here we see the first tray, assembled at Peking University, which arrived at CERN in September last year.

📣 Vote for your favourite physics picture 📸 Last year, CERN opened its doors to 17 photographers and invited them to explore, through their lens, the accelerators of tomorrow.

#ThrowbackThursday to the winter of 1977 💫 Here we see Eliane de Modzelewska with her colleagues, finalising gifts for retiring Council members, Wolfgang Gentner and Jan Hendrik Bannier. #FunFact: the gifts were made from pieces of glass that once formed part of a bubble chamber window.

Advancing cancer therapy with next-generation radionuclides The PRISMAP programme, coordinated by CERN, has provided 159 radionuclide batches for cancer research over the past five years.

POV: you walk through CERN’s labs 👣 Today, CERN’s #PhotoOfTheWeek features a series of images captured by Theodore Lianopoulos during the 2025 CERN Photowalk competition, held last year. #PhysPics25 📸 by Theodore Lianopoulos Image size has been adjusted to fit platform requirements.

Kickstart your future in science 🚀 Have you ever wondered what it’s like to conduct your own experiment at CERN? High-school students from all over the world can now apply for the Beamline for Schools (#BL4S) competition.

Have you read the new issue of #AcceleratingNews? 🧐 It features news on the High-Luminosity #LHC, the proposed electron-positron Future Circular Collider (FCC-ee), the ongoing update of the European Strategy for Particle Physics, alternative future colliders, events, and much more.

Here we see the Inner Tracker of the @atlasexperiment.bsky.social (ATLAS ITk). This new all-silicon inner detector of the ATLAS experiment at CERN replaces the previous one to cope with the higher luminosity of the #HiLumiLHC – the successor to CERN’s Large Hadron Collider.

The good old days 🔙 This #ThrowbackThursday, we take a look at different sides of the Laboratory, highlighting the wide range of professions that kept the Organization running in earlier decades.

Today, CERN’s #PhotoOfTheWeek features a series of images captured by Laurent Cabot during the 2025 CERN Photowalk competition, held last year. #PhysPics25 📸 by Laurent Cabot Image size has been adjusted to fit platform requirements.

📣 Applications are open for the 2026 STEAM Academy 📅 Application deadline: 15 February 2026 🛏️ On-site accommodation and meals for the full 10 weeks 📩 Questions: [email protected] 🔗 Apply now: nextgentriggers.web.cern.ch/cern-steam-academy/

CERN wishes you a very #HappyNewYear! In 2026, we will prepare for the installation of the High-Luminosity Large Hadron Collider (#HiLumiLHC) – the successor to the world’s most powerful particle accelerator – while shaping the next generation of discovery machines.

Ho, ho, ho under CERN’s mistletoe 🧑‍🎄 Today’s #PhotoOfTheWeek features CERN’s "Father Christmas" team touring the Laboratory just before Christmas Eve, all the way from the #LHC tunnel to the @atlasexperiment.bsky.social and @cmsexperiment.bsky.social#PhotoOfTheWeek#LHCetectors.

CERN Highlights 2025 As the year comes to a close, we reflect on some of the highlights from this remarkable year at CERN. We are looking forward to 2026 as we continue to search for what’s beyond the horizon. Watch here: youtu.be/X_OoXSMXyLg?...

🎁 The supporting structure of the new CMS HGCAL detector has arrived at @cern.bsky.social for assembly! 🛳️ 🚚 After an eight-week journey, the first HGCAL absorber structure was delivered and is ready to be assembled ready for #HiLumi! 👉 cms.cern/news/support...

This is TELMAX (Test Line for Machine and Antimatter eXperiments), the world’s first test beamline using antiprotons, located at CERN’s Antimatter Factory.

Private donors pledge 860 million euros for CERN’s Future Circular Collider A consortium of private donors (individuals and philanthropic foundations) have agreed to support the proposed Future Circular Collider at CERN Find out more: home.cern/news/press-r...

The magic of Christmas #AtCERN 🎄   This #ThrowbackThursday brings you back to winter celebrations at the Laboratory over the years.Which picture is your favourite? 👇

A cryogenic winter for tomorrow’s accelerator 💫 The first large refrigerators for the #HiLumiLHC have been installed. Here we see the delivery of a cold box on the @atlasexperiment.bsky.social site. Find out more: home.cern/news/news/ac...

CERN hits one exabyte of stored experimental data from the LHC #LHC 📈 One million terabytes of experimental data from the Large Hadron Collider have now been sent to the CERN storage system. Find our more: home.cern/news/news/co...

Today, CERN’s #PhotoOfTheWeek features a series of images captured by Erik Kuna during the 2025 CERN Photowalk competition, held earlier this year. #PhysPics25 Image size has been adjusted to fit platform requirements.

Celebrating two decades of global scientific computing Developed to handle the vast amounts of data of the #LHC experiments, the Worldwide LHC Computing Grid (WLCG) has significantly marked the landscape of distributed computing. Find out more: home.cern/news/news/co...

Looking for a fun activity to do over the holiday season? 🔎 From public events and science shows to hands-on experiments, interactive physics demonstrations, and exhibitions, CERN Science Gateway has something for everyone, from age five and up. Plan your visit: visit.cern/

📣 Pre-registration for Beamline for Schools (#BL4S) is open. Beamline for Schools (#BL4S) is a #physics competition open to high-school students from all over the world.

The 3000°C Test 🌡️ To endure the increased beam intensities and stored energies of CERN's next hadron collider, the High-Luminosity #LHC, the beam dump system - an essential part of the accelerator's machine protection systems - must be upgraded.

Here we see BioDynaMo, the Biology Dynamics Modeller, an open-source, agent-based simulation software originally designed to model the behaviour of billions of cells. These visuals demonstrate how BioDynaMo can be used to study biological processes at scale.

The first coherent spin spectroscopy on a single antiproton performed by the BASE collaboration #AtCERN is recognised as one of the 2025 Top 10 Breakthroughs of the Year by @physicsworld.bsky.social.

The European Strategy for Particle Physics reaches an important milestone At its 225th session, the #CERN Council received the recommendations for the update of the European Strategy for Particle Physics. Read more: home.cern/news/press-r...

This #ThrowbackThursday we feature a set of event displays from 1987, recorded by the NA35 experiment. NA35 was a particle physics experiment #AtCERN, using particle beams from the SPS.  It studied relativistic nucleus–nucleus collisions to search for evidence of new forms of quark matter.

ALICE solves mystery of light-nuclei survival Observations of the formation of light-nuclei from high-energy collisions may help in the hunt for #DarkMatter. Read more: home.cern/news/news/ex...

LHC delivers a record number of particle collisions in 2025 💫 *cue the holiday music* 🎄 After a few final laps around the ring, the beams of the Large Hadron Collider were paused at 6.00 a.m. on Monday, 8 December for the usual year-end technical stop.

Today, CERN’s #PhotoOfTheWeek features a series of images captured by Joan Torrijos during the 2025 CERN Photowalk competition, held earlier this year. #PhysPics25 Which one is your favourite? Let us know below. 👇 Image size has been adjusted to fit platform requirements.