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Carl Sagan singularly popularized SETI for me. Science writers argued that an enormous number of individually unlikely steps were required to produce something very like a human being, and that the chances of such a precise repetition occurring on another planet were nil; and therefore that the chance of extraterrestrial intelligence was nil.
But when we're talking about extraterrestrial intelligence, we are not necessarily referring to humanoid life. We are talking about the functional equivalent of humans - any creatures able to build and operate radio telescopes. They may have unimaginable chemistries, shapes, sizes, colours, appendages and opinions. There may be many different evolutionary pathways, each unlikely, but the sum of the number of pathways to intelligence may nevertheless be quite substantial. No doubt many lifeforms were removed from natural selection, but even locating one lifeform capable of radio transmission would be the find of a lifetime, which is why I'm interested in the project. |
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