Question

the energy released by the sun result from a series of nuclear fission reaction​

Answer 1

$\huge\star\bold\red{ANSWER}$

The Sun is a main-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 500 million metric tons of hydrogen each second. The nuclear binding energy curve. The formation of nuclei with masses up to iron-56 releases energy, as illustrated above.