Summary

Deep beneath the French-Swiss border, the world's largest scientific instrument has fallen silent. After years of smashing protons together at nearly the speed of light, CERN's Large Hadron Collider (LHC) has stopped operations and entered a long shutdown. While no particle collisions are taking place at the LHC , thousands of scientists, engineers and technicians are dismantling parts of the machine, installing new technologies and preparing one of the most ambitious upgrades ever attempted in experimental physics.

AI summaries can be wrong sometimes—always verify important details using the source article.