Stars or the sun is a hot ball of gases mainly hydrogen and helium.These gases play a major role in our life along with the existence of the universe.
Stars are powered by these gases for this purpose there is a continuous reaction at the core of the stars in which two hydrogen atoms combine together to form one helium atom and energy is released.In stars there are uncountable number of hydrogen gases and these reactions are continuous everywhere ,thus producing tremendous energy.This reaction is called "FUSION".That is why stars always gives out light or energy.
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