The Gravitational Instability Model

The Gravitational Instability Model explains how structures like galaxies and galaxy clusters form in the universe. It suggests that small initial density fluctuations in the early universe were amplified by gravity. Regions slightly denser than their surroundings pulled in more matter, becoming increasingly massive over time. This process led to the formation of large-scale structures, with matter clustering into filaments, walls, and clusters. Essentially, gravity amplified tiny irregularities to create the cosmic web of galaxies we observe today, illustrating how the universe's large-scale structure emerged from initial small variations under the influence of gravity.