I have wanted to write this essay for a very long time now, and, finally, relieved of the pressure of daily publishing, the time has come. Even if you don't care about the search for extraterrestrial intelligence, I still think you'll enjoy this essay — Dave
Despite many years of observation with ever-more sophisticated instruments, humans have failed to find any signs of extraterrestrial intelligence (ETI). Physicist and cosmologist Paul Davies calls this The Eerie Silence.
If there are extraterrestrial civilizations out there, they don't seem very interested in us. They don't visit, they don't phone, they don't even send radio signals. Not a peep. It is easy to feel start feeling neglected once you become aware of this cosmic cold shoulder. As the eminent physicist Enrico Fermi once put it, "Where is everybody?"
It is not as if we haven't been looking out for them. This year marks 50 years since the founding of SETI — the Search for Extraterrestrial Intelligence. In his new book celebrating this anniversary, Paul Davies explains that SETI isn't some confederation of UFO-spotters, but a group of serious scientists who scour the skies for any sign that somebody is trying to get in touch. They have deployed every modern technology in search of unusual radio signals, laser pulses or electronic beacons. But so far they have come up empty-handed. There is nothing to hear but an eerie silence.
The "eerie silence" is more generally known as Fermi's Paradox. I wrote a brief introduction to the subject in Are We Alone In The Milky Way? This essay is the first of two on the ETI existence question, and how humans approach that question.
Some knowledgeable people don't think ETIs exist, or occur very rarely (are thinly scattered) in time & space. I will describe the views of these "pessimists" in Part II. This essay is about the optimists.