Large Hadron Collider: World's biggest physics experiment
The Large Hadron Collider (LHC), a particle accelerator and the largest machine in the world, is ready for action following a two-year shutdown.
After problems that delayed the restart in March, scientists at the European Organization for Nuclear Research (CERN) completed final tests, enabling the first beams to start circulating Sunday inside the LHC's 17 mile (27 km) ring.
It took thousands of scientists, engineers and technicians decades to devise and build the particle accelerator, housed in a tunnel between Lake Geneva and the Jura mountain range.
CERN claims the energies achievable by the LHC have only ever been found in nature.
Scientists and physics enthusiasts will be waiting with bated breath as the LHC ventures into the great unknown.