A view of the Large Hadron Collider in its tunnel at CERN in Switzerland. Martial Trezzini/AP hide caption
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
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
The Universe of Particles exhibition at CERN in 2011. Fabrice Coffrini/AFP/Getty Images hide caption