A new theory proposes a second, invisible type of hydrogen atom that could resolve the neutron lifetime puzzle and explain dark matter. Two experimental methods for measuring neutron lifespan yield differing results; this discrepancy may be due to neutrons sometimes decaying into an invisible hydrogen atom and a neutrino, going undetected. This invisible hydrogen, predicted by a solution to the Dirac equation, could account for a significant portion of dark matter. Experiments are underway to test this theory, potentially revolutionizing particle physics and cosmology.

Prepared by Olivia Bennett and reviewed by editorial team.