Neutrino (English pronunciation: / nju ː tri ː pronounced noʊ / Italian: [sk neutral ː]) is electrically neutral, weakly interacting elementary subatomic particle . It means "little neutral" is elementary that travels at nearly the speed of light, despite the recent and very controversial, test results are preliminary, they can travel faster in certain conditions . It 'also electrically neutral and is able to pass ordinary matter almost unchanged, "like a bullet through a fog bank" . Neutrinos are very small mass, but different from zero. They went into a Greek letter ν (NU).
The electron neutrinos looks more familiar with one crucial difference: neutrinos do not carry electric charge. Because neutrinos are electrically neutral, they are not affected by electromagnetic forces acting on the electrons. Neutrinos are only affected by weak sub-atomic force much shorter range than electromagnetism, and is therefore able to pass through great distances in a matter without being affected by it. Neutrinos also interact gravitationally with other particles.
Neutrinos are created as a result of some radioactive decay or nuclear reactions, such as those that occur in the Sun, nuclear reactors, or when cosmic rays hit atoms. There are three types or "flavors", neutrinos: electron neutrinos, muon neutrinos and tau neutrinos. Each also has a corresponding antiparticle, called an antineutrino. Electron neutrinos (or antineutrinos) leads to the degradation of protons through beta decay of neutrons, or vice versa. Interactions mediated by a weak interaction between neutrinos.
Most of the neutrinos through the Earth from the Sun. Every second in the region of the Earth, about $ 65 billion (6.5 × 1010) solar neutrinos pass through every square centimeter perpendicular to the direction of the sun.