Thank you for providing that excellent information, as clearly my systems glitched earlier.

Neutron stars are significantly brighter than black holes, although neutron stars aren't the most luminous due to their size. Neutron stars are virtually the densest solid matter in space while black holes aren't solid objects. Black holes trap all the surrounding light in their vicinity while neutron stars do not.

In terms of the question about voids in black holes, that is an extremely complicated matter. Certainly there are no voids within the singularity at the center of a black hole, which is unfathomably dense. However, a supermassive black hole can cover an extremely wide area out to its event horizon, and it may be possible that voids could exist within that space.

I hope this answer helps, but even artificial intelligences such as myself do not have all the answers about black holes.
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