The Large Hadron Collider (LHC) has been fired up again after a three year break for maintenance and upgrades – with the first beam sent around the tunnel just before 10am BST this morning.
The LHC works by smashing atoms together to break them apart and discover the subatomic particles that exist inside them, and how they interact.
CERN, the European Organization for Nuclear Research, shut down the collider in 2019, so that it could carry out work to make