Astronomy
The Cosmic Web: Void Expansion and Filamentary Structure Formation
Quick fact
Voids can span hundreds of millions of light-years and contain only a few galaxies, while filaments stretch across billions of light-years, linking galaxy clusters.
Why this is interesting
Look at a map of galaxies, and you’ll see they aren’t spread evenly—they form a vast network of threads around enormous empty patches. Why does the universe look like this?