The Large Hadron Collider at Cern has been switched back on this morning, after a major reboot.
Scientists from the Cern research body have doubled the power of the atom smashing device.
They're hoping new data from the collider will help unlock the secrets of Dark Matter, and revolutionise our understanding of the universe.
The huge machine has already discovered the Higgs Boson and features 27 kilometres of tunnels straddling the border between France and Switzerland.
