Physicists want to drill a 5-kilometre-deep hole on the moon

Drilling a 5-kilometre-deep hole in the moon could finally provide evidence that protons can fall apart, claim a group of physicists. If this previously unseen behaviour is spotted, it would help efforts to unify incompatible physics theories.

The standard model of particle physics, which is our best working picture of how the forces and particles that make up our universe interact, says that protons are…