Neutrinos may pull their own weight in the universe

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Abstract

How many neutrinos are enough? The answer depends on what you need them for. If you want to find them and measure their energy, preferably in a proton decay detector, 1017 must go through the detector to yield just a few records of the particles' passing. But according to a study by physicists at a NASA laboratory, if you're interested in calculating a neutrino's rest mass, the dozen or so the detector catches are sufficient and could help provide an explanation for the “missing mass” that may fill most of the Universe.

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