The Large Hadron Collider's ATLAS detector under construction in 2005. ATLAS is one of the tools physicists are using to try and understand how the universe works. Maximilien Brice/CERN hide caption

itoggle caption Maximilien Brice/CERN

High-energy physics in action: an image of an event in CERN's CMS detector during the search for the Higgs boson. CERN hide caption

itoggle caption CERN

The Universe of Particles exhibition at CERN in 2011. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images