A cosmic timeline refers to the chronological sequence of events and developments in the history of the universe from its initial formation to the present day. This research area explores the evolution of the universe, including the Big Bang, the formation of galaxies and stars, the development of planets and life forms, and potential future scenarios such as cosmic expansion and the eventual heat death of the universe. Scientists and researchers use a variety of tools and methods, such as cosmological models, computer simulations, and observational data from telescopes, to study and understand the vast expanse of time and space that make up the cosmic timeline.