A slab cut from the cube generated by the Illustris simulation. It shows the distribution of dark matter, with a width and height of 350 million light-years and a thickness of 300000 light years. Galaxies are found in the small, white, high-density dots. Credit: Markus Haider / Illustris collaboration. Click for a full size image
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, 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 the universe.
Looking at cosmic microwave radiation, modern satellite obs...
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