The term for the study of the universe is "cosmology." This branch of astronomy focuses on understanding the origins, evolution, structure, and eventual fate of the universe. Cosmologists explore various aspects of the universe, including the Big Bang theory, dark matter, dark energy, and the cosmic microwave background radiation. Through observations, mathematical models, and simulations, they seek to answer fundamental questions about the universe's composition and the laws governing its behavior. Cosmology not only encompasses the study of celestial bodies but also delves into philosophical inquiries about the nature of existence and our place within the cosmos.