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Carrying the metaphor further, that's closer than America was to Europe in the 18th century.

That's an interesting perspective.

Tangentially, I've long wondered about sci fi like Star Trek. Namely, even with FTL, how large can your interplanetary alliance be? How far away can the parliament be? Over what distances can you defend against common enemies? Trade? Culturally exchange ideas?

I have had similar thoughts as well. Assuming FTL isn’t possible, at some point it wouldn’t make sense to have a cohesive system. Say, there’s an outpost that is 30 years away by the fastest spacecraft.

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