The Large Hadron Collider has been Shut Down, and Will Stay Down for Two Years While they Perform Major Upgrades. The Large Hadron Collider (LHC) is getting a big boost to its performance. Unfortunately, for fans of ground-breaking physics, the whole thing has to be shut down for two years while the work is done.

Is CERN still operating?

CERN's atom smasher will restart for the first test beams in May 2021, two months later than planned, and operate from March 2022 until the end of 2024.

When was the last time CERN was turned on?

On September 10, 2008, scientists successfully flip the switch for the first time on the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) lab in Geneva, kicking off what many called history's biggest science experiment.