We've long known that the Large Hadron Collider would need to take a break, but that doesn't take the edge off of the moment itself: as of Valentine's Day, the particle accelerator has conducted its last test for the next two years. The giant research ring will undergo sweeping repairs and upgrades Full story
An extremely rare particle measurement from the world's largest atom smasher could cast doubt on a popular theory about the fundamental building blocks of the universe, including dark matter. Full story
The world's largest atom smasher has tides, it turns out. The moon, which pulls Earth's seas in and out with its gravity, similarly affects the Large Hadron Collider in Europe, requiring physicists to make periodic adjustments to the extremely sensitive machine. Full story
A technician cycles in the Large Hadron Collider at the Organization for Nuclear Research in the French village of Cessy near Geneva in Switzerland April 15, 2013. As hundreds of engineers and workers start two years of work to fit out the giant LHC particle collider to reach deep into unknown re
Proton-proton collisions at the Large Hadron Collider in Geneva
A computer simulation shows what the Large Hadron Collider's ATLAS detector would see when the decay of a Higgs boson results in the production of two gamma rays. The blue beads indicate intermediate massive particles, and the bright green rods are the gamma-ray tracks.
Scientists monitor operations at the Large Hadron Collider.
This schematic shows how the excited neutral Xi-b baryon decays into other subatomic particles that could be detected at the Large Hadron Collider's Compact Muon Solenoid.
Richard Hawkings, ATLAS physics coordinator at the European CERN particle physics center, watches over computer displays at the control center for the Large Hadron Collider's ATLAS experiment. The LHC has started proton collisions at the unprecedented energy level of 4 TeV per beam.