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First off, the aliens aren't that far away, relatively speaking. Most of our signals are pretty weak, especially compared to the radio output from our sun, and you'd have to be pretty close and...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:17Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/41233 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/