Spacecraft guidance is a research area that focuses on developing systems and algorithms to control and navigate spacecraft in the vast expanse of outer space. This involves using various sensors, mathematical models, and computer algorithms to determine the position, orientation, and velocity of a spacecraft, as well as to plan and execute maneuvers to reach a desired destination or orbit. The goal of spacecraft guidance is to ensure the safe and efficient operation of spacecraft, as well as the successful achievement of mission objectives. This includes tasks such as trajectory planning, attitude control, orbit determination, and collision avoidance. Researchers in this field work on developing advanced guidance systems that can handle the complexities of space missions, such as gravitational forces, orbital dynamics, and communication delays. Overall, spacecraft guidance is a critical component of space exploration and satellite operations, as it enables spacecraft to navigate through the challenging environment of space with precision and accuracy.