Simulation of the Future Circular Collider tunnel. The new accelerator is planned to be approximately 91 kilometers long at CERN. Credit: CERN.

Simulation of the Future Circular Collider tunnel. The new accelerator is planned to be approximately 91 kilometers long at CERN. Credit: CERN.

Simulation of the Future Circular Collider tunnel. The new accelerator is planned to be approximately 91 kilometers long at CERN. Credit: CERN.