How high-mass stars evolve
Stars that are 12 or more solar masses are high-mass stars. These stars consume their fuel even faster than immediate-mass stars. As a result, high-mass stars die more quickly and more violently. In massive stars, the core heats up to much higher temperatures. Heavier elements form by fusion, and the star expands into a supergiant. Eventually, iron forms in the core. Since iron cannot release energy through fusion, the core collapses violently, and a shock wave travels through the star. The outer portion explodes, producing a supernova.