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Further plausible (?) elaboration on Fermi Paradox

  1. Oct 17, 2007 #1
    Relating to Fermi Paradox, how far away from earth might the oxygen signature of our atmosphere be spectographically detectable? The flip side is how far away might an exo-terrestrial planet's atmospheric oxygen signature be detectable? For example,Gliese 581 c,d are larger (5-7x earth) terrestrial planets at 20 lyrs distance.[http://en.wikipedia.org/wiki/Gliese_581_c]So it might seem possible that at a far distance, any visiting simple (to re-build) mini-robotic craft (with a spectographic capability) could covertly survey it's larger environment. Hence a fast, cost effective, and extensive way of surveying for surface life; thus for our planet, over 2 billion years of significant oxygen signature exposure. Of course there would be no residual evidence from any such oxygen signature detection of life.

    see Fermi paradox and Von Neumann probes
  2. jcsd
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