Astronomy: Astronomy is the scientific study of celestial objects, such as stars, planets, galaxies, and other cosmic phenomena. It focuses on observing, measuring, and understanding the physical properties and behaviors of these objects. Astronomers use telescopes and other instruments to gather data from distant parts of the universe. They study the positions, motions, compositions, and interactions of celestial bodies to gain insights into the nature of the universe. Astrophysics: Astrophysics is a branch of physics that applies the principles and techniques of physics to study the behavior and properties of celestial objects. It combines the disciplines of astronomy and physics to understand the physical processes and phenomena occurring in the universe. Astrophysicists use mathematical models, computer simulations, and observational data to investigate topics such as the formation and evolution of galaxies, the behavior of stars, the nature of black holes, and the origin of the universe itself. Difference: While astronomy and astrophysics are closely related fields, there are some key differences between them. Astronomy primarily focuses on the observation and description of celestial objects, their positions, and their motions. It involves the collection of observational data and the identification of patterns and phenomena in the universe. On the other hand, astrophysics delves deeper into the underlying physical principles and processes that govern the behavior of celestial objects. It involves the application of physics theories and techniques to understand the nature, structure, and evolution of the universe. Astrophysicists use mathematical models, computer simulations, and experimental data to explain the observed phenomena and make predictions about the universe. In summary, astronomy is concerned with the observation and description of celestial objects, while astrophysics focuses on the physical understanding and explanation of those objects. Astrophysics is essentially a subset of astronomy that applies the tools and concepts of physics to study the universe.