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Are we looking for intelligent extraterrestrial life in the right places?
In an advanced intelligent life system scenario the life would have
to have accomplished things we would find it difficult to imagine.
We should be looking for giant systems floating in space that
have streams of traveling machines very active and full of lights and
lasers and smoke and gases and radio waves and a mess of
information such as looking at one of our cities and the messes
we produce. I think they would have moved away from their
planet and into space. In space all systems can be controlled
mechanically no weather no earthquakes etc.
Are we looking for the telltale signs of a space society.
There is a distinct possibility that your question suggests cultural biases as to HOW intelligent life would manifest itself. Some people would argue that intelligence might show itself more as a successful adaptation to communal life of the mind (vs massive techno-'extreme-engineering'-mass-formers)
It would likely be easier to find traces of mechano-societies "out there". However, if an extra-terr race enclosed the energy output from their sun/star in a Dyson-sphere, the likely "search-target" would be in the infrared portion of the spectrum.
"seeing" discrete objects at interstellar distances is technologically impossible at today's levels.
What we *ARE* looking for is rather hard to say, however it appears that SETI is focussing on such:
SETI has adopted these assumptions in their search, looking for such "infrared heavy" spectra from solar analogs.As of 2005 Fermilab has an ongoing survey for such spectra by analyzing data from the Infrared Astronomical Satellite (IRAS).
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