The insatiable appetite of lonely black holes.

New observations have found over 20,000 "hungry" black holes in cosmic voids, which are essentially "3D bubbles of space" that contain just a handful of galaxies, if any at all. These invisible beasts "snack" more often when there are fewer interacting neighbors to interrupt them. The findings challenge the current understanding of how galaxies evolve and how black holes grow in galaxies that are friendless in their cosmic neighborhood and thus do not interact with each other.