Kalim was an Indian scientist and aerospace engineer who played a key role in developing India's ballistic missile and space programs. He studied physics and aerospace engineering. Throughout his career, he held positions at DRDO and ISRO, helping develop India's missiles and space program. Aeronautics involves the study and engineering of air flight machines, including aircraft and rockets. It is concerned with aerodynamics, the interaction between air and flight vehicles. Different types of aircraft discussed include the Wright Flyer, the first successful airplane; Boeing 787, a modern airliner; and the Lockheed SR-71, a supersonic spy plane.