Do superclusters exist in the universe?

Answer

Superclusters are clusters of clusters.

Our galaxy is a member of a cluster, the ‘local group’. Further on we see clusters, such as in the constellation Virgo. We call all these clusters together the ‘local supercluster’.

Of course you wonder where it stops. Well, pretty much at those superclusters. When we speak of a cluster, it is because we see that galaxies belong together in groups. Then we find that such groups are sometimes closer and sometimes further from other clusters: we sometimes see groups of clusters close together, closer together than the typical distances between clusters, and we speak of superclusters. But it is also not noticeable that – on very large scales in the universe – there would also be a kind of convergence of superclusters. From length scales of several hundreds of millions of light years, the universe is comparable everywhere, there are no regions with significantly more galaxies than elsewhere.