What catastrophic explosion occurs when the iron core of a massive star violently rebounds?
Answer
Type II Supernova.
When the iron core of a massive star (generally greater than 8 solar masses) can no longer support itself against gravity because iron fusion consumes energy, the collapse occurs with extreme rapidity, achieving speeds up to 70,000 kilometers per second. When this incredibly dense core reaches nuclear density, it stiffens abruptly and rebounds violently against the infalling outer layers of the star. This rebound generates a massive outward shockwave that drives the spectacular, catastrophic explosion known as a Type II Supernova. This event is crucial because it temporarily outshines entire galaxies and is responsible for synthesizing and scattering all elements heavier than iron throughout the cosmos.
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