| neutrino |
Any of three tiny uncharged subatomic particles of the "lepton" class. They are produced by the Sun, other stars, and supernovae. Roughly 10 million neutrinos from the Sun will pass through your body while you read this sentence. Neutrinos travel at the speed of light; by the time you have read this paragraph, the neutrinos that passed through your body will be further away than the Moon.
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