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![How will humanity first discover ET Life?
Best guess: biosignatures for life in general,
but technosignatures for intelligent life (although low probability)
About biosignatures: [Microbes] could be freeze-dried on the
Red Planet, [or] it cold be something under the ice of Enceladus, a moon of Saturn.
About technosignatures: If the emergence of intelligence on another world
had followed the similar evolution to what has happened here,
then were we to detect ET, we would be most unlikely to catch it in the
brief sliver of time when it is still organic. For our Earth, between
four and a half billion years before technology emerged, [life’s] been
around for a few millennia, maybe one more millennium, it’ll be
superseded by electronic intelligence which will then go on for
billions of years. So that means that it’s far more likely if we
detected something artificial, it would be not an organic civilization
but something which was created by a long dead organic civilization.](Rees100th/Slide2.JPG)