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Particle collision. Simulated computer display of a particle collision (beams radiating from centre) in part of the large hadron collider (LHC, inner cylinder) at CERN (the European particle physics laboratory) near Geneva, Switzerland. Surrounding the LHC, CERN's highest energy particle accelerator, is ALICE (a large ion collider experiment) detector. ALICE will detect and record the particles produced when lead ions are accelerated to very high energies and collided within the LHC. It is expected to produce quark- gluon plasma, a primordial state of matter thought to have been present in the Universe microseconds after the Big Bang. A pilot run of the LHC is scheduled for summer 2007.
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