Cosmic models are theoretical frameworks that describe the structure and evolution of the universe. They help scientists understand how galaxies, stars, and planets form and interact over time. Common models include the Big Bang Theory, which suggests the universe began from a singular point and has been expanding ever since, and the Steady State Theory, which proposes that the universe is eternal and maintains a constant average density. These models are based on observations and mathematical equations, allowing researchers to make predictions about cosmic phenomena. They also guide the study of dark matter and dark energy, which are crucial for explaining the universe's behavior and fate.