Question

what is neutrino ? how are they formed ?

Answer 1

Neutrinos are fundamental particles that were first formed in the first second of the early universe, before even atoms could form. They are also continually being produced in the nuclear reactions of stars, like our sun.

They are formed from the Sun produces energy by the proton - proton chain nuclear fusion reaction. 

Answer 2

Answer:

Explanation:

A neutrino is a fermion that interacts only via the weak subatomic force and gravity. The neutrino is so named because it is electrically neutral and because its rest mass is so small that it was long thought to be zero