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zankaon
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Oxygen signature of a planet's atmosphere
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? Also then this would be the distance at which any visiting simple (to re-build) mini-robotic craft (with a spectographic capability) could survey it's environment. Hence a fast and easy way of surveying for life; for our planet, over 2 billion years of exposure.
see Fermi paradox and Von Neumann probes
http://en.wikipedia.org/wiki/Fermi_Paradox
http://en.wikipedia.org/wiki/Exoplanets
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? Also then this would be the distance at which any visiting simple (to re-build) mini-robotic craft (with a spectographic capability) could survey it's environment. Hence a fast and easy way of surveying for life; for our planet, over 2 billion years of exposure.
see Fermi paradox and Von Neumann probes
http://en.wikipedia.org/wiki/Fermi_Paradox
http://en.wikipedia.org/wiki/Exoplanets
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