Why does the sun shine?
During nuclear fusion, hydrogen atoms are fused to form helium atoms. Nuclear fusion, then, allows a star to produce NEW ELEMENT BY COMBINING OTHER ELEMENTS. The sun changes about 600 billion kg of hydrogen into 595.8 billion kg of helium per second. From these numbers 4.2 billion kg of the original mass of the hydrogen seem to be lost every second. the missing mass has been changed to energy. Most of the mass is changed into heat and light. And that's why the stars SHINES....