The study of the universe is called cosmology. Cosmology is a branch of astronomy that explores the origins, evolution, structure, and ultimate fate of the universe. It involves the investigation of concepts such as the Big Bang, cosmic inflation, dark matter, and dark energy. Cosmologists use a combination of astronomical observations, theoretical physics, and mathematical models to understand the nature of the universe, its large-scale structure, and the forces that govern it. This field contributes to our knowledge of how galaxies, stars, and planetary systems form and evolve over cosmic time.