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By Jaelyn Smith
On June 29, 2026, the Large Hadron Collider, the largest particle accelerator in the world, was turned off. This happens every 4 years. Engineering teams are preparing for the next operational phase, and they estimate it’ll be offline until 2030. The purpose of this particle accelerator is to uncover the basic building blocks of the universe. The primary goal of the shutdown is not to increase the energy of the machine, but to radically increase its luminosity, the number of particle collisions that occur within a given timeframe.
The Large Hadron Collider (LHC) is the world’s largest and most powerful particle accelerator that pushes protons or ions to near the speed of light. It consists of a 27 kilometer ring of superconducting magnets with a number of accelerating structures to boost the energy of the particles along the way. It sits in a tunnel 100 meters underground at CERN, the European Organization for Nuclear Research, on the Franco-Swiss border near Geneva, Switzerland.
Photo Courtesy of AP News
The Large Hadron Collider while being worked on by scientists. It's expected to be running again in 2030.
Many physicists hope that the LHC will help answer some of the fundamental open questions in physics, which concern interactions among elementary particles and the deep structure of space and time, particularly the interrelation between quantum mechanics and general relativity. These high-energy particle experiments can provide data to support different scientific models.
Scientists started thinking about the LHC in the early 1980s, when the previous accelerator, the LEP, was not yet running. The idea was to reuse the LEP tunnel to host a machine able to collide protons instead of electrons. In December 1994, the CERN Council voted to approve the construction of the LHC and in October 1995, the LHC technical design report was published. Between 1996-1998 construction began. In September 2008, construction was finished and testing began.
While the shutdown is a routine logistical step, it has triggered widespread speculation among the public. Many dismiss these claims as internet folklore, but some educators agree with this. Brett Kunkle, physics teacher, said, “I think that it's reasonable for people to assume there are localized effects within nature from the accelerator.
The claim that the LHC alters nature is part of the internet myth known as the "Mandela Effect.” In reality, the collisions generated by the LHC occur at a subatomic scale. While they involve high energy levels per particle, the total energy produced in these localized collisions is incredibly small. They have no measurable impact on the Earth's environment, weather, or natural laws.
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