Galactic surveys have revealed that the universe has a “bubbly texture.” Almost all galaxies are found within giant arcs surrounding enormous voids, some more than 300 million light years across, containing little other than empty space. Though it can’t be seen, dark matter dominates most of the structure.
As seen in the simulation above, the universe is arranged into great collections of knots, sheets, and filaments. These formations got their start from the tiny fluctuations in the cosmic background radiation, which represent areas of slightly more or less density. As the universe evolved, these small inhomogeneities attracted matter to them, which snowballed over billions of years into the enormous collections we now see.
Source: Wired
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