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AABoyles comments on If there IS alien super-inteligence in our own galaxy, then what it could be like? - Less Wrong Discussion
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If (1) is true the aliens should fear any type of life developing on other planets because that life would greatly increase the complexity of the galaxy. My guess is that life on earth has, for a very long time, done things to our atmosphere that would allow an advanced civilization to be aware that our planet harbors life.
This is actually a fairly healthy field of study. See, for example, Nonphotosynthetic Pigments as Potential Biosignatures.