I believe the story referenced is "At The Core", where stars at the core of the galaxy have gone supernova and thereby started a supernova chain reaction expand

I believe the story referenced is "At The Core", where stars at the core of the galaxy have gone supernova and thereby started a supernova chain reaction expanding outward from the core into the surrounding stars of the galaxy. https://en.wikipedia.org/wiki/At_the_Core https://en.wikipedia.org/wiki/At_the_Core