A star generates energy by

Nuclear fusion. Most stars (the so-called "main sequence" stars) convert hydrogen-1 into helium-4.

Nuclear fusion. Most stars (the so-called "main sequence" stars) convert hydrogen-1 into helium-4.

Nuclear fusion. Most stars (the so-called "main sequence" stars) convert hydrogen-1 into helium-4.

Nuclear fusion. Most stars (the so-called "main sequence" stars) convert hydrogen-1 into helium-4.