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But isn't there a certain probability we missed those radio waves back when we didn't know radio and now the earth is receiving more sophisticated signals human

• saudioger 8y ago
  Sure, it's also possible the universe immediately surrounding us was teeming with life a billion years ago and we just missed it all anyway. We can only try our best with the current means we have available.
• cde-v 8y ago
  We could have missed those signals millions of years ago, but we could also start receive a civ's first ever radio broadcast tomorrow (that would be incredibly lucky).
  • jcelerier 8y ago
    > we could also start receive a civ's first ever radio broadcast tomorrow (that would be incredibly lucky). not a chance. Our own radio transmissions barely go past the solar system before going under the noise floor.
    • saagarjha 8y ago
      Maybe not their first radio broadcast, but possible one of their early, directed ones…