Astrophysics is the branch of astronomy that deals with the physical properties and behavior of celestial objects and phenomena. This includes the study of stars, galaxies, and the universe as a whole. Astrophysicists use principles of physics, chemistry, and mathematics to understand and explain the observations made by telescopes and other instruments. This can include topics such as the origin and evolution of the universe, the properties of black holes and other exotic objects, and the detection and characterization of planets outside our solar system. Additionally, Astrophysics also involves the study of the formation of stars and planets, the nature of dark matter and dark energy, and the search for extraterrestrial life. In short, Astrophysics is the study of the universe and everything in it, using the laws of physics.