Scientists believe they have captured the elusive "God particle" that gives matter mass and holds the physical fabric of the universe together.
The Science & Technology Facilities council announced that CERN has found a new particle.
It has the properties of Higgs boson but will need verifying to check that it has all the properties.
It's been confirmed by CERN as a "5 sigma" level which means it's officially a discovery.
Professor John Womersley. chief executive of the Science and technology Facilities Council, told reporters at a briefing in London:
They have discovered a particle consistent with the Higgs boson.
Discovery is the important word. That is confirmed.
It's a momentous day for science