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This fact can explain with the help of nuclear fusion in small stars and massive stars

in small stars like our sun nuclear fusion followed by the proton -proton chain reaction in which main products are positron, gamma ray photon, neutrino and isotopes of hydrogen and helium and energy released in millions of electron volts but in the case of massive stars nuclear fusion is followed by the carbon-nitrogen-oxygen cycle and helium can further transform into the carbon by triple alpha process and in the massive star much heavier elements can burn producing very large amount of energy than our sun and some of the massive star can produce luminosity 60000 times more than our sun

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