re: It's just stupid how big space is and how small Earth is

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It is possible that it is physically impossible to travel the distances required for contact in the lifespan of any sentient organism. There may be no way to do, no matter how technologically advanced a civilization becomes.

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That's a defeatist attitude. Sentience isn't necessarily limited to organic-based creatures. The next step in the evolution of sentience on earth is likely to be artificial intelligence. A.I. will not have the physical limitations of organic creatures that evolved here.