Neutrinos are experimentally determined to have an extremely small mass. Huge numbers of neutrinos are created in a supernova at the same time as massive amounts of light are first produced. When the 1987A supernova occurred in the Large Magellanic Cloud, visible primarily in the Southern Hemisphere and some 100,000 light-years away from Earth, neutrinos from the explosion were observed at about the same time as the light from the blast. How could the relative arrival times of neutrinos and light be used to place limits on the mass of neutrinos?

A fermion that solely interacts with gravity and the weak interaction is a neutrino. Because it is electrically neutral and has a rest mass that was previously believed to be zero, the neutrino earned its name.

A neutrino is a subatomic particle produced by beta decay. It's a massless, uncharged particle. Supernova was an agreement with the speed of light. The difference in neutrino and light arrival times was approximately three hours.

This can be explained by the fact that neutrinos were able to pass supernovae because there were no impediments and light took a long time to pass. This study found that neutrinos have mass.

As a result of the nearly identical arrival time of light and neutrinos, limits on neutrinos' mass have been placed.