The primary focus of astrophysics is the study of celestial bodies and the universe as a whole. This branch of science combines principles from physics and astronomy to explore the properties, behavior, and interactions of objects in space, such as stars, planets, galaxies, and black holes. Astrophysicists seek to understand fundamental questions about the origins of the universe, its structure, and its eventual fate. This field also covers phenomena such as cosmic radiation and the expansion of the universe.