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Serious query. Given the fact, that life as we know it, is a mathematical equation.....what parameters might we recognize...or be recognized be, as intelligence.

curious>>

Very narrowband signals from space do not occur naturally. So we are looking for that very signature. We are not looking for any modulation or intelligence in the signal; just the presence of a narrowband signal is enough.

The search I am involved in does not look for any radio signals purposely beamed at us. I am looking for another race that has developed far enough down the technological road to have developed radio like we have. There appears to be only 4 fundamental forces in all of nature; Strong Force, Weak Force, Gravity, and Electromagnetism EM. Both the strong force and Weak force are confined to the nucleus of the atom. Gravity requires prodigious amounts of energy to manipulate, so the only one that is practical for long distance communication is EM. In an extremely short period of time, we are using EM across the entire spectrum from basically DC to light. We are now radiating that same spectrum into outer space. In fact at certain frequencies, we are the brightest object in the known heavens. So what we are looking for, is a race that is doing the same thing we are, unintentional radiation of radio wave into outer space in all directions. To up the odds a bit, we have decided to point our dishes strait down our own spiral arm. This give us the maximum number of stars in each patch of the sky we are looking at. We also are looking at multiple frequencies. My modest little search is looking a 3.1 million frequencies (soon to be 30 million) for the duration of any object in the beam path of our antennas.