Galaxy filaments are clusters of galaxy superclusters, which makes them the largest known structures in the Universe. The appropriately—named Hercules Corona Borealis Great Wall is the largest known galaxy filament — making it the largest known structure in existence.
Galaxy filaments are kind of like the Universe’s countries. If our home country, the Pisces Cetus Supercluster Complex, is the size of Germany, the Hercules Corona Borealis Great Wall is around the size of Russia. An outrageous 10 billion light years across, the HCB Great Wall stretches over a tenth of the way across the observable Universe!
Keishinrei 