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Martin J. Rees

Martin J. Rees
 Lord of Ludlow
 Astronomer Royal of the UK: Since 1995
 Emeritus Professor of Cosmology & Astrophysics: University of Cambridge
 Chair of Advisory Group: Breakthrough Listen Project
 Author: Our Cosmic Habitat�
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 superseded by electronic intelligence which will then go on for 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.