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by Dominisi
2318 days ago
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The issue with using general "Earth-like electromagnetic communications technology" is the inverse square law. Our own communications aren't distinguishable from the cosmic background radiation even at our closest neighbor. The only way we would find something is if they pointed a VERY powerful noise source directly at us, or us at them. And even then, we are looking at maybe a 100 lightyear bubble (~600 main sequence stars). |
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Do you mean we could detect ordinary technological EM radiation if we pointed a sufficiently high-gain antenna at the transmitting planet ?
Otherwise if SETI assumes someone is sending an interstellar signal on purpose, I would question its value, because there's no strong reason to think anyone is doing that. I realize we did it once, but an argument can be made (and has been) that it was a fairly stupid thing to do.