This is a "slice" of about 700 million light-years across in the distribution of galaxies in the universe. Voids are marked as blue circles, and galaxies within as red dots. The image shows a void galaxy that harbors an actively accreting black hole in its center; such activity is revealed by its optical spectrum exhibiting emission spikes, characteristic of hot gases ionized by light emitted from matter swirling around a supermassive black hole.