Cosmologists study the origin, evolution, and ultimate fate of the universe, focusing on its large-scale structures and the fundamental forces that govern them. They analyze cosmic phenomena such as the Big Bang, dark matter, dark energy, and cosmic microwave background radiation using theoretical models and observational data. By employing advanced mathematical tools and technology, they aim to understand the universe's composition and the laws of physics that dictate its behavior. Their research helps unravel the mysteries of galaxies, stars, and the universe as a whole.