The energy that heats the sun has its origin in
the production of helium from hydrogen
The Sun’s energy comes mainly from nuclear fusion in its core, where hydrogen nuclei combine to form helium and release energy.
Nuclear energy is generated by
A positron is an anti-particle of an electron, having the same mass but opposite charge to electron. Then, the minimum energy released in annihilation of matter of a pair of an electron and a positron is nearly: