Europe’s physics lab CERN is planning to build a particle-smasher even bigger than its Large Hadron Collider to continue searching for answers to some of the universe’s tiniest yet most profound mysteries.

The Future Circular Collider (FCC) has not yet received a political green light or funding. Even if approved, the vast project would not start operations until the 2040s—or be completed until the end of the century.

CERN’s Large Hadron Collider (LHC), which famously discovered the “God particle” Higgs boson and is currently the world’s powerful particle accelerator, is expected to have run its course by the 2040s.