A spacecraft or artificial satellite can be comprised of eight hardware subsystems: Command & Data Handing (C&DH), Electrical Power System (EPS), Guidance, Navigation, & Control (GN&C), Structures (STRUCT), Mechanisms (MECH), Telemetry, Tracking, & Command (TT&C), Thermal Control, Payload, and Propulsion. Non-hardware subsystems include Flight Software, an Orbital Analysis team, a Mission Operations Center (MOC), and a Ground Control Station (GCS). ABEX does not feature propulsion and includes particle radiation analysis within the Thermal Control team. Let's learn more about the ABEX subsystems.