Utilities
Distinctive on-orbit supply chains and physical infrastructure for common goods for use in-orbit
Child applications
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Power
Electrically recharging a satellite using an intermediary (rather than directly from own spacecraft solar panels)
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Compute
Provision of computing services (e.g. data processing, storage and servers) by in-orbit assets
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Policing
Enforcement of regulations
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Communications
Inter-satellite communications or space-to-ground relays
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PNT
Positioning, navigation, and timing