The study of celestial objects is called astronomy. This branch of science explores the universe beyond Earth, including stars, planets, comets, galaxies, and the cosmos as a whole. Astronomers use principles of physics and mathematics to study celestial phenomena, helping to understand the formation, evolution, and behavior of these objects. Astronomy is divided into various sub-disciplines, such as observational astronomy, theoretical astronomy, and astrobiology. It has been essential in answering fundamental questions about the universe’s origins, structure, and the possibility of life beyond our planet.