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- Civilian use
- Astronautics and state 6
- Government policy 4
- Space industrialization 4
- Astronautics, Military 2
- Exploration 2
- History 2
- Political aspects 2
- Prevention 2
- Private flying 2
- Security measures 2
- Space flights 2
- Space race 2
- Space security 2
- Space surveillance 2
- Space tourism 2
- Space warfare 2
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