Filaments, Voids & Superclusters: Observation, Measurement & Evidence

Dense nodes host galaxy clusters, filaments connect those nodes, walls or sheets contain extended galaxy concentrations, and voids occupy most cosmic volume with far fewer galaxies.

Three-dimensional redshift surveys reveal web-like galaxy distributions over enormous volumes. Weak lensing, peculiar velocities, and simulations show that dark matter traces a similar underlying network.

Tiny primordial density differences grow under gravity. Matter flows out of underdense regions and toward denser structures, producing anisotropic collapse into sheets and filaments before gathering into halos and clusters.

Redshift surveys reveal three-dimensional web geometry, while weak lensing and simulations trace the underlying matter distribution. Void galaxy populations provide a complementary low-density test.