Stars explode through two main processes. The most common, a type II supernova, happens when a massive star runs out of nuclear fuel in its core. Gravity then wins over the outward push of radiation, the core collapses, and a huge burst of energy blasts the star’s outer layers into space. A different type, a type I supernova, occurs when a white dwarf pulls too much material from a companion star or collides with another star. This restarts nuclear fusion and triggers a collapse.
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