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The Soyuz spacecraft has three parts:
- A round orbital module
- A small reentry module
- A service module with solar panels
Orbital module [change]
The orbital module is also called the Habitation section. It has all the equipment not needed for reentry, such as experiments, cameras and cargo. It also contains a docking collar for docking to space stations. It does not come back to earth.
Reentry module [change]
The reentry module is used for launch and the journey back to earth. Half of it is covered in heat protection tiles. It comes back to earth.
Service module [change]
The service module has solar panels. It contains systems for temperature control, electric power supply, long-range radio communications and radio telemetry. It does not come back to earth.