The Large Hadron Collider has successfully created a "mini-Big Bang" by smashing together lead ions instead of protons. The scientists working at the enormous machine on Franco-Swiss border achieved the unique conditions on 7 November. The experiment created temperatures a million times hotter than the centre of the Sun.
Up until now, the world's highest-energy particle accelerator - which is run by the European Organization for Nuclear Research (Cern) - has been colliding protons. Read more and see a clip here LHC lead-ion collisions image from www.bbc.co.uk