Elements by Subsystem

• Structures

- Primary Structure

- Pressure Vessels

- Equipment Support

• Mechanical

- Positioning and Translation

- Access Hatches and Panels

• Power and Electrical

• Propulsion

- Main Propulsion

- Auxiliary Propulsion

- Aerodynamics

• Thermal

- Thermal Protection

- Thermal Control

• Data

- Processors

- Storage

- Network

- Software

• Communications

• Sensors

• Displays and Controls

- Ground Software

- Data and Communications Hardware

- Flight Software

- Sensors and Instruments

- Artificial Intelligence and Autonomous Operation

- Trained Operators

• Internal Environment

- Atmosphere Maintenance and Regeneration

- Waste Management

• External Environment

- Debris Protection

- Radiation Protection

• Crew Support

- Food

- Clothing

- Health Maintenance

• Maintenance and Repair

- Tools and Equipment

- Spares and Stocks