What is Neutrino?
{{Infobox particle | name = Neutrino/Antineutrino | image = [[File:FirstNeutrinoEventAnnotated.jpg|280px]] | caption = The first use of a hydrogen [[bubble chamber]] to detect neutrinos, on November 13, 1970. A neutrino hit a proton in a hydrogen atom. The collision occurred at the point where three tracks emanate on the right of the photograph. | num_types = 3 – electron neutrino, muon neutrino and tau neutrino | composition = [[Elementary particle]] | statistics = [[Fermion]] | group = [[Lepton]], antilepton | generation = First, second and third | interaction = [[Weak interaction]] and [[gravitation]] | particle = | antiparticle = Antineutrinos are possibly identical to the neutrino (see ''[[Majorana fermion]]''). | theorized = {{SubatomicParticle|Electron neutrino}} (Electron neutrino): [[Wolfgang Pauli]] (1930)<br />{{SubatomicParticle|Muon neutrino}} (Muon neutrino): Late 1940s {{SubatomicParticle|Tau neutrino}} (Tau neutrino): Mid 1970s | discovered = {{SubatomicParticle|Electron neutrino}}: [[Clyde Cowan]], [[Frederick Reines]] (1956)<br />{{SubatomicParticle|Muon neutrino}}: [[Leon Lederman]], [[Melvin Schwartz]] and [[Jack Steinberger]] (1962)<br />{{SubatomicParticle|Tau neutrino}}: [[DONUT|DONUT collaboration]] (2000) | symbol = {{SubatomicParticle|Electron neutrino}}, {{SubatomicParticle|Muon neutrino}}, {{SubatomicParticle|Tau neutrino}} | mass = Small, but non-zero. | decay_time = | decay_particle = | electric_charge = 0&nbsp;[[elementary charge|e]] | color_charge = | spin = {{frac|1|2}} | X_charge = −3 | weak_hypercharge = −1 | B-L = −1 }} '''Neutrinos''' are a type of [[elementary particle]] that exist all across the universe. The word ''neutrino'' means a small neutral particle. [[Physicists]] study these particles, but they are hard to find because they have a very small chance of interacting with [[matter|regular matter]]. (For example, they usually pass through the whole [[earth]] without touching any other [[particle]]s). Neutrinos travel near the [[speed of light]].<