Daniel Whiteson, Time Traveler
Stuff To Blow Your Mind
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Is There a Coherent Galactic Civilization?
Time is actually one of the arguments against the idea of a coherent galactic civilization, if this makes any sense. So it's hard to imagine that people in the future having time travel and somehow keeping it a secret. But there's a speed limit to information moving through the universe which puts an effective limit on how well you can coordinate and organize things.
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