Voids take up about 98% of the volume of the universe, with galaxies huddled into superclusters that occupy the thin walls that surround the voids. But this doesn't necessarily mean that the voids are virtually empty. On the contrary, it is possible that they contain most of the mass of the universe in the form of dark matter, some os which may be present as dark galaxies.
Voids are the natural result of the way gravity causes matter in the universe to clump together, herding galaxies into clusters and chains, which are separated by regions mostly devoid of galaxies. Understanding the structure and growth of voids could help astronomers learn more about the properties of dark matter and dark energy.
The Milky Way Galaxy itself lies in a large, flat array of galaxies known as the Local Sheet, which bounds a dark region called the Local Void.
Related category COSMOLOGY
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