Scientists at the CERN research centre in Geneva have successfully fired up a huge particle-smashing machine, in the first stage of a mission to re-enact the conditions of the Big Bang that created the universe.
The experiment in the Large Hadron Collider, an accelerator built underneath the Swiss-French
border, could unlock the remaining secrets of particle physics and answer questions about the universe and its origins.
The LHC fires beams of particles through a
27-kilometre tunnel, in which they collide at the speed of light.