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Which neutrino is the heaviest?
05/13/21
By Scott Hershberger
The question may seem simple, but physicists don’t yet know the answer. New measurements aim to change that.
Neutrinos are the featherweights of the subatomic world. These extremely plentiful, rarely interacting particles are at least 500,000 times lighter than electrons. They are produced in the sun, in exploding stars, and in decay processes on Earth even ones in your own body. But they interact so infrequently with other matter that you’d hardly know there are so many of them around.
For decades physicists thought these ghostly particles were massless. But experiments revealed that neutrinos do have mass. In fact, there are three types of neutrinos and three different masses.