We live in a universe dominated by unseen matter and on the largest scales, galaxies and everything they contain are concentrated into filaments that stretch around the edge of enormous voids. Thought to be almost empty until now, a group of astronomers now believe these dark holes could contain as much as 20% of the normal matter in the cosmos and that galaxies make up only 1/500th of the volume of of the universe.
Source: Royal Astronomical Society
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