A supernova is an Earth term for a stellar explosion, far more energetic than a nova that expels most, if not all of a star's matter at roughly 1/10 the speed of light, sometimes leaving behind a dense core that can form into a neutron star or collapse into a black hole. Such an explosion will cause the star's luminosity to increase by as much as 20 magnitudes, briefly outshining whole galaxies before fading. The phenomena can be caused either by a gravitational collapse or by a massive accretion of hydrogen from a stellar neighbour resulting in a runaway nuclear fusion reaction.

Omelos, the Dilgar homeworld was destroyed when its native star went supernova in 2232[1]

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