Last Three Stages

When the star begins to run out of fuel it expands into a supergiant.

Finally the star fuses iron in its core which sucks energy away from the star. With the iron taking all the energy, the star doesn't have enough energy left. With gravity winning the fight against fusion to destroy the star, the star collapses in on its core. When the star gets that small, it gets so hot and dense that the star explodes. This explosion is called a supernova.

The star will then become a neutron star.

If the star is massive enough, then it is possible that it could become a black hole after it supernovas. A black hole is an object whose gravity is so strong that nothing, not even light, can escape.

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