Origin of Cosmic Structure

The large-scale structure of the universe, including galaxies and clusters, originated from quantum fluctuations shortly after the Big Bang. These minor density variations were magnified over billions of years by gravitational forces, which attracted more matter to denser regions, leading to the formation of galaxies and their arrangements today. For instance, fluctuations present 10 to the minus 35 seconds post-Big Bang acted as foundational seeds from which gravitational attraction created the complex structures we now observe. This process has resulted in a cosmic web, marked by huge walls of galaxies and voids, revealing the intricate organization of matter in the universe.