Contact: Tona Kunz
DOE/Fermi National Accelerator Laboratory
Caption: Scientists know that there exist three types of neutrinos and three types of antineutrinos. Cosmological observations and laboratory-based experiments indicate that the masses of these particles must be extremely small: Each neutrino and antineutrino must weigh less than a millionth of the weight of an electron.
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Related news release: Fermilab experiment measurements decrease surprise difference in neutrino and antineutrino masses