article_snippet.sent: the LHC is situated underground below the border between Switzerland and France, and consists of nearly 17 miles of circular tunnels.
article_snippet.sent: After two beams of particles were sent flying through the tunnels at a speed just slower than light, Cern's director general Rolf Heuer said: 'Congratulations.
article_snippet.sent: Particles of protons, the 'hearts' of atoms, travel round The LHC at just three metres per second below the speed of light.
article_snippet.sent: Inside: The LHC consists of an enormous circular tunnel which is nearly 17 miles long .