Or why visit at all? Curiosity seems to be a feature of life, but we're all on the same branch of life here, maybe that's unusual.
Maybe most advanced civilizations grow internally, ending up as cultures inhabiting vast virtual realities powered by planet sized computers. Or they just build their Von Neumann machines that spread over the galaxy razing solar systems of their resources to send home, or converting solar systems to sterile shrines to their power.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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