Quantum Gravity's Impact on Neutrinos Examined.

Physicists have identified seven neutrinos that arrived on Earth later than expected, compared to their companion gamma rays, suggesting that ultra-relativistic neutrinos blasted into space during gamma-ray bursts are slowed down by the effects of quantum gravity. While the effect is extremely small, if the particles are created in an astrophysical event billions of light–years away, the cumulative result would be a delay that could be measured when the particles arrive on Earth. The observation would be a major step forward in understanding quantum gravity and its role in the evolution of the universe.