The Control Centre of the Large Hadron Collider (LHC) at the European Organisation for Nuclear Research (CERN) in Prevessin near Geneva. The LHC has been turned on for the first time after two years of upgrades. Denis Balibouse/Reuters/Landov hide caption

itoggle caption Denis Balibouse/Reuters/Landov

This is what researchers at the ATLAS detector at the Large Hadron Collider expect a Higgs boson to look like. The Higgs boson is the subatomic particle that scientists say gives everything in the universe mass. ATLAS Experiment/CERN hide caption

itoggle caption ATLAS Experiment/CERN

This is what researchers at the ATLAS detector at the Large Hadron Collider expect a Higgs boson to look like. The Higgs boson is the subatomic particle that scientists say gives everything in the universe mass. ATLAS Experiment/CERN hide caption

itoggle caption ATLAS Experiment/CERN