Which of the following is NOT one of the three segments of space systems?

The three segments of space systems typically include orbital, terrestrial, and link components. Each segment contributes to the overall functionality and operation of space systems.

The orbital segment refers to the hardware that operates in orbit around Earth or other celestial bodies, which includes satellites and space stations. The terrestrial segment encompasses systems and facilities on the ground that support space operations, such as control centers and user terminals. The link segment pertains to the communication paths and systems that connect space assets with ground control and users, ensuring data transmission and operational command.

Atmospheric, while closely related to space systems as it involves the layer of air surrounding Earth, is not classified as one of the primary segments of space systems. Hence, it is correctly identified as not being one of the main components that delineate the structure of space operations. Understanding these segments helps in comprehending how different elements work together in space missions and operations.