What are Neutrinos?

About Neutrinos:

• Neutrinos are mysterious particles, produced copiously in nuclear reactions in the Sun, stars, and elsewhere.
• They also "oscillate"-- meaning that different types of neutrinos change into one another.
• A neutrino is a fermion that interacts only via weak interaction and gravity.
• Probing of oscillations of neutrinos and their relations with mass are crucial in studying the origin of the universe.
• Neutrinos are created by various radioactive decay; during a supernova, by cosmic rays striking atoms etc.

What is Antiparticle?

• In quantum theory, every type of particle is associated with an antiparticle with the same mass but with opposite physical charges. For example, the antiparticle of the electron is the positron.