|it fuses helium to carbon to iron (and other elements), then continues to release more energy by fusing the iron to heavier elements such as uranium.
|it fuses elements up to uranium, and continues to produce energy by the fission of uranium.
|it fuses helium to carbon and other elements up to iron and then ceases to produce more energy
|it fuses helium to carbon and then ceases to produce more energy
|ceases to convert nuclear energy.