Most of the universe is not filled with stars, galaxies, or glowing nebulae. Instead, much of it is made up of enormous regions that appear almost empty.
These areas, called cosmic voids, can stretch for hundreds of millions of light-years and contain very few galaxies.
But these regions are not simply empty space. Cosmic voids are active parts of the universe’s structure. They expand, change shape, and sometimes merge with other voids, helping form the large-scale pattern of matter across the cosmos.
So what exactly are cosmic voids, and how did they form? Why are they so unusual, and what role could they play in the future evolution of the universe?
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