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The four crucial systems, or groupings of parts, of a rocket are as follows: the structural system, the payload system, the guidance system, and the propulsion system. The propulsion system takes up most of the space on a rocket. This is where the fuel and oxygen are located and how the rocket moves. The structural system is the frame that covers the rocket. The payload is the "stuff a rocket is carrying" such as a satellite that is meant to go into space. Lastly, the guidance system helps guide the rocket and can be made up of many components, such as radar and computers.