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(Credit: Stephen Shankland/CNET)
The LHC, which fits into the underground tunnel used by an earlier accelerator at CERN, is 27 kilometres in circumference. For scale, the Geneva airport is at the far end of the circle in this shot and the Alps are in the distance.
(Credit: Claudia Marcelloni/CERN)
A 2007 photo shows a worker making the final connections in the LHC ring. Some of the work will be redone after a planned shut-down before the accelerator is run at full power.