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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsScientists briefly recreate an early-universe-like state by smashing heavy atomic nuclei together in particle accelerators. The collisions can produce quark–gluon plasma, an extremely hot, dense state in which quarks and gluons are no longer confined inside protons and neutrons. The plasma cools almost immediately; detectors record the particles that emerge, and researchers use their patterns to infer what the plasma was like. This recreates an analogous state of matter—not the Big Bang itself or the scale of the early universe.
How does a collision make early-universe-like matter?
- Accelerate heavy ions. Facilities strip electrons from atoms to make ions, then accelerate beams toward one another. CERN describes head-on gold or lead collisions at energies of several trillion electronvolts; ATLAS describes nuclei accelerated above 100 GeV and close to the speed of light. These are facility-specific descriptions, not one universal collision setting. CERN’s heavy-ion explainer and ATLAS’s overview explain the process.
- Form a microscopic fireball. The energy density in the collision can free quarks and gluons from the protons and neutrons in which they are normally bound. This deconfined state is called quark–gluon plasma, or QGP. CERN says LHC collision temperatures are more than 100,000 times the temperature at the centre of the Sun. That is a comparison for the collision temperature, not a measure of the fireball’s size or lifetime. CERN’s ALICE overview
- Let the fireball expand and cool. As the QGP evolves, quarks and gluons recombine into ordinary particles, including pions, kaons, protons and neutrons. Those particles stream outward to detectors. The process is rapid, but the sources here do not establish one directly comparable numerical lifetime for the laboratory fireball. CMS’s account of matter formation
- Infer the plasma from the aftermath. Scientists compare the particles’ energies, directions and production patterns with theoretical models. The detector does not take a literal picture of the plasma; researchers reconstruct its properties from the evidence the collision leaves behind.
What can scientists learn from the outgoing particles?
Jet quenching shows how energetic particles lose energy
A collision can produce two energetic jets travelling in roughly opposite directions. If one crosses the dense fireball, it may emerge weakened relative to the other. CERN describes this jet quenching and explains that energy loss depends on the path through the medium. Comparing the jets’ energy, direction and composition helps researchers characterize the QGP. CERN gives a density comparison of 30 to 50 times that of an ordinary nucleus for the fireball crossed by jets; that figure describes this fireball, not a universal value for every collision. CERN’s heavy-ion explainer
Collective flow preserves clues about collision geometry
The initial shape and geometry of a collision influence the angular distribution of the particles that come out. Researchers study this collective flow and compare it with fluid-dynamics calculations to learn how the medium expanded. The measured particle pattern is evidence; describing the evolving QGP as a fluid is an interpretation tested against calculations. ATLAS’s overview
Strange particles help diagnose QGP formation
The production of strange quarks and particles containing them is another diagnostic. ATLAS calls multistrange antibaryon production a “gold standard” indicator, but it is one line of evidence rather than a stand-alone proof. ATLAS, citing the NA57 experiment’s 2006 result, reports that certain hadrons made entirely from newly created quarks were 15–20 times more abundant in heavy-ion reactions than in the expected reference proton–proton system. That result applies to those hadrons and that comparison, not to every strange particle or collision system. ATLAS’s overview
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Why collide different nuclei?
Lead and xenon collisions create relatively large plasma droplets. Studying different ion species and collision geometries helps researchers separate the effects of system size, nuclear shape and the way the nuclei overlap. A head-on collision and a more glancing one do not begin with the same geometry, and that difference can leave traces in particle flow.
Smaller systems help test how small a collision can be while still showing QGP-like behavior. ALICE notes that proton–proton and proton–nucleus collisions have collective features resembling those in nuclear collisions, but such features are being investigated; they do not establish that every small collision creates QGP. ALICE’s physics overview
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On 18 September 2025, CERN reported that the LHC’s first high-energy oxygen–oxygen and neon–neon collisions had yielded flow measurements. The results supported a role for nuclear geometry and sharpened evidence about neon’s elongated shape. The same report discussed lead–argon and lead–neon fixed-target results using data recorded in 2024. These are reported research findings, not a statement about the LHC’s current operating schedule. CERN’s 18 September 2025 report
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does “recreate the first moments” really mean?
The early universe contained QGP during its first microseconds. Accelerator experiments create a tiny, short-lived state of matter analogous to that cosmic plasma, then study how it behaves. They do not reproduce the universe’s size, expansion or origin, and they do not observe the Big Bang. Instead, they investigate how matter behaves under extreme conditions by measuring what a controlled collision leaves behind.
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The scale difference is substantial even within the laboratory: CERN says the ALICE detector is 26 metres long, 16 metres high and 16 metres wide, and weighs 10,000 tonnes. Those figures describe the instrument that records collision products—not the plasma droplet itself. CERN’s ALICE overview
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