Solar neutrinos are neutral subatomic particles that are created as one of the products of the fusion process in the sun. They belong to the family of neutrinos, which are one of the fundamental building blocks of the standard model of particle physics. Neutrinos have a very low mass and interact only very weakly with matter, which makes them extremely difficult to detect.

During the fusion process in the sun, especially in the core, hydrogen atoms are fused into helium. This produces immense energy, which is released in the form of photons and neutrinos. The sun emits a large number of neutrinos into space, which can then be measured by detectors on earth or in space.

The discovery of solar neutrinos was an important proof of the correctness of the standard model of particle physics and has deepened our understanding of how stars and the universe work.