Observing large quasar groups

One of the pillars of current cosmology is the cosmological principle. It holds that at large enough scales any observer would see a homogeneous distribution of matter from every point — the universe would look isotropic, or the same in all directions. There should be no preferred position and no central point of view.

Another pillar is the prevailing theory that describes the universe: the (ΛCDM) model, also known as the “standard model”. It states that the universe is composed of baryons (what all visible matter is made of); cold dark matter that interacts only through gravity; and a repulsive force causing the universe’s expansion to accelerate. The model predicts the maximum size of structures allowed within such a universe — but