Detecting unintentional signals

[lake]

Detecting unintentional signals

from other worlds

"Assuming Sol-3 is a terraformed planet, we can be sure the terraformer civilization left somewhere a beacon, or a system of networked beacons to signal its presence to future generations of terraformers. Radio waves are obviously discarded, and the best candidate seems to be a powerful modulated neutrino short pulse of some sort"



"it should be assumed that an average time of civilisation radio usage must exist. This time interval will be called tcomm. In line with this thinking, it is also quite reasonable to assume that civilisations don't last forever but that they all have certain average life span tciv. Naturally, tcomm can never be larger than tciv"



"Due to limitations of radio communication technologies over interstellar distances and limited sensitivity of our radio receivers, signals emanating from an alien civilisation could only be detected within a certain radius around the alien radio transmitter."

"The probability of detecting signals from alien civilisations is equal to the probability of detecting a signal from at least one alien civilisation. And this probability is our goal. We can detect signals from any number of civilisations, but signals from just one civilisation will also "do the trick" quite nicely."



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