Carrying on from that first sentence: "in the center of the galaxy, stars are only 0.4–0.04 light-years apart" The most luminous stars going by Wikipedia are

Carrying on from that first sentence: "in the center of the galaxy, stars are only 0.4–0.04 light-years apart" The most luminous stars going by Wikipedia are about 5 million times brighter than the Sun. Not sure if those are anywhere near galactic centres though.