Particle physicists in Europe intend to build a 91-kilometer-long circular collider—the largest accelerator ever—to smash electrons into positrons, officials at the European particle physics laboratory, CERN, announced today in an online press conference. The Future Circular Collider (FCC) would be completed by the mid-2040s, after CERN’s current atom smasher, the 27-kilometer-long Large Hadron Collider (LHC), winds down. It would cost 15 billion Swiss francs, or about $19 billion—and it might pave the way for a much more powerful, and expensive, successor.
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