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 intermediate stars. As a result, high-mass stars die more quickly and more violently. The core will heat up and the heavier elements form by fusion and the star expands into a supergiant. Eventually Iron forms in its core. Since iron cannot release energy through fusion. the core collapses violent, and a shock wave travels through the star. The outer portion of the star explodes, producing a supernova. A supernova can be millions of times brighter than the original star.