A white dwarf, a dead star that has exhausted its nuclear fuel, can explode in a Type Ia supernova when it steals material from a companion star in a binary system; as the stolen gas accumulates on the white dwarf, it becomes increasingly unstable until the carbon inside ignites in a runaway nuclear reaction, causing the star to tear itself apart.
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A Dead Star Can Explode by Feeding on Another Star #shortsAjouté :
A dead star can explode by feeding on another star. That sounds impossible because a dead star should be finished.
No fuel, no fire, no second death. But some dead stars called white dwarfs are not always alone. If a white dwarf has a nearby companion star, it can steal material from that star. The stolen gas spirals onto the white dwarf, making it heavier and more unstable. Eventually, the pressure becomes too much. Carbon inside the white dwarf ignites in a runaway reaction, and the dead star tears itself apart in a supernova. So, this is not just a star exploding. It is a stellar corpse feeding until it dies again.
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