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Originally Posted by Martian
You're basing this entirely on an unsupported assumption. We have no evidence that intelligent life is abundant, so any line of reasoning based on that is idle conjecture.
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Well, I did say "
if intelligent life is abundant." And the rest is deduction from that statement. If X is true, then possibly Y.
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Also, stellar spectrometry only reveals information about the star in question and not it's orbiting planets. We can use that information to deduce what may be there, but can say nothing conclusive about what is there.
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Yes, but by studying the emissions of the star, you know what kind of radiation it's giving off, and in what magnitude. If it's a brown dwarf or a quasar, the chance of intelligent life evolving or surviving in that system is low. And if life is sustained, it's not likely to be compatible with our methods of communication. Yes, I don't know for sure, but there are some obvious likelihoods here.