• Proton, neutron, and electron are tiny particles that make up atoms.
• The neutrino is also a tiny elementary particle, but it is not part of the atom.
• Such particles are also found to exist in nature.
• Neutrino has a very tiny mass and no charge. It interacts very weakly with other matter particles.
• So weakly that every second trillions of neutrinos fall on us and pass through our bodies unnoticed.
• Neutrinos come from the sun (solar neutrinos) and other stars, cosmic rays that come from beyond the solar system, and from the Big Bang from which our Universe originated.
• They can also be produced in the lab.

Source: ForumIAS