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So, I'm not into writing or creating any new worlds, but this question (or a set of questions) was bothering me for a while and I thought it's a good place to ask.

  1. If there exists an alien civilization in a nearby star system (i. e. Alpha Centauri) and it has a similar technology level to ours (producing the same amount of radio noise), would we be able to detect it?
  2. Are we at this point 100% sure there are no such civilizations in nearby star systems?
  3. If there's a civilization nearby with similar technology to ours (or more advanced but still scientifically plausible) do they already know that we're here?
L.Dutch
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  • Also worth reading: https://space.stackexchange.com/questions/17765/from-how-far-away-could-our-seti-searches-detect-and-recognize-our-technological – Morris The Cat Aug 05 '19 at 14:22
  • Welcome to worldbuilding. We have a 1 question per post policy, while you have 3 questions here, and I am not fully sure they are about worldbuilding. Moreover, you are using the hard science tag, are you sure about it? Please take the [tour] and visit the [help], then narrow down your question and make it fit our scope. – L.Dutch Aug 05 '19 at 14:22
  • Hi, thanks for the linked questions. That's basically what I've been looking for, so this one can be closed. – Przemysław Czechowski Aug 05 '19 at 14:46
  • You should have got a notification about the duplicate. If you accept the suggestion, the question will be closed as duplicate automatically. – L.Dutch Aug 05 '19 at 15:04

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