The life cycle of a star is how it evolves through its long life nand what it turns into. What path the star rakes though depends on its size. meduium stars become red giants,then plentary nebulas, and finally a white dwarf. Large stars become red supergiants, to a super nova, and then either a netron star or a black hole. Stars are born when ever gasses start to mix in a nebula. Our sun will be taking the oath of a medium star.