White Dwarfs and Thermonuclear Runaway For stars with a mass up to about eight times that of the Sun, the end involves shedding their outer layers. The simple definition captures the immense release of energy and light that briefly outshines entire galaxies.
Supernova Simple Definition Cosmic Phenomenon
Iron cannot be fused to release energy. The Core-Collapse Mechanism Massive stars, exceeding eight solar masses, face a different fate.
When the core accumulates enough iron, it collapses under gravity within seconds. When the hydrogen fuel is exhausted, the star's structure changes dramatically depending on its mass.
Supernova Simple Definition Cosmic Phenomenon
Type Trigger Progenitor Star Type Ia Thermonuclear explosion of a white dwarf White dwarf in a binary system Core-Collapse Core implosion due to iron accumulation Massive star (8+ solar masses). This event occurs when a star depletes its nuclear fuel, leading to a catastrophic collapse or violent disruption.
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