The chronology of the universe describes the timeline of cosmic evolution, beginning with an extremely hot, dense initial state. The initial rapid expansion phase led to the cooling of the nascent cosmos, allowing fundamental forces and subatomic particles to stabilize and combine into protons and neutrons. Following this, the universe entered a period of matter domination, leading to the formation of the first neutral atoms and the subsequent decoupling of matter and radiation, allowing light to travel freely through space. Over immense timescales, gravitational forces gathered this matter into the first structures, which eventually coalesced into stars and galaxies. These stars served as primary engines for synthesizing heavier elements through nucleosynthesis, enriching the interstellar medium. The overall cosmic history is characterized by an ongoing expansion, a measurable decrease in matter density, and an ultimate fate dictated by the interplay between gravitational forces and the prevailing energy components.