Theoretical Astronomy is a branch of astronomy that focuses on developing models and simulations to understand celestial phenomena. It combines principles from physics and mathematics to explain the behavior of objects in the universe, such as stars, galaxies, and black holes. By using theoretical frameworks, astronomers can predict how these entities evolve over time and interact with one another. This field plays a crucial role in advancing our knowledge of the universe. For instance, theories about dark matter and dark energy help explain the universe's expansion and structure. Theoretical astronomers often collaborate with observational astronomers to validate their models against real-world data.