If we look at our history, humans capable of communicating beyond our local neighborhood, we can say that intellegent life has been around for just over 100 years. But even within that short period, we have seen several major changes in technology. There was plain old radio, then tv and now digital broadcasts. In addition, the advent of satellite tansportation means that the actual number of radiating sources has probably gone down and their directionality has gone up. Instead of sources broadcasting wide area patterns, modern sources radiate as narrow, directed a beam as possible towards a specific site, the satellite used for relay.
What that means is that there may well be a very small window when remote detection of human like civilizations is possible.
In addition, the existence of human like critters is yet another tiny percentage of the time life has been around in the one example we're familar with. And of the various critters that have lived, we are still so new that the jury is out on whether or not we will be successful or even significant.
On the otherhand, if we look at the Universe it appears that all the laws we know of work about the same everywhere. So far we have found no real examples of known laws or effects behaving in a totally unexpected way.
If that is the case, and if it is a fact that known laws are universal, I see no reason not to expect life to originate most everywhere.
Aslan is not a Tame Lion
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