Quote:
Originally Posted by Steven Lyle Jordan
The factor L is the only one that represents a factor of time, and as I indicated, specifies how long a civilization can send signals... but not when. A new variable, S, needs to be introduced that compares the period of time during which a civilization exists simultaneously with our own, in order for such signals to have a chance of being intercepted.
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The longer any two civilisations exist, the more likely it is that they exist at the same time, that is pretty simple.