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The existence of extraterrestrial intelligence (ETI) has been debated since the ancient Greeks. Views have never been unanimous, and the center of opinion has periodically shifted between positive and negative. Over the last few decades, both intellectual and public opinion have been decisively in the pro-ETI camp.
Unfortunately, the debate has taken place on a very slanted playing field, at least in the United States.
Among astronomers, the pro-ETI forces have gained the power to effectively squash dissenting opinion in recent years. This power is exemplified by the "gatekeepers" at popular and even some refereed science journals, and by the successful public relations of the SETI institute (see, for example, the movie Contact).
While I was a "believer" in ETI most of my life, I changed my mind about 10 years ago, after I thought carefully about the astronomical and geophysical requirements for advanced life in the universe. I found that ETI proponents were ignoring basic constraints such as high levels of radiation in many regions of the universe.
to the M 13 star cluster -- not recognizing that the cluster's shortage of heavy elements makes it an unlikely abode for radio listeners.
I kept my opinions about all this to myself until July 16, 1997, when a number of news events relating to ETI came together in a cosmic (or is that comic?) conspiracy: the enormous popularity of two alien flicks, Men in Black and Independence Day; the August 1996 "discovery" of remnants of life in a martian meteorite and the 50th anniversary of the "discovery" of an alien spacecraft near Roswell, New Mexico.
Having reached the breaking point, I fired off a letter to the Wall Street Journal -- something I have never previously, nor since attempted. To my surprise, they published it on their op-ed page, with the title "Nobody Here but Us Earthlings."
While I was a 'believer' in extraterrestrial intelligence most of my life, I changed my mind about 10 years ago.
My Journal article led to two radio interviews and an invitation to publish a longer article in Society, a sociology journal. What I learned from the experience is that it's extremely difficult to get valid dissenting scientific opinion published in the usual places, especially if it goes against public opinion as well.
I've also found that the debate on ETI is not so strongly one-sided overseas. The British semi-technical journal Astronomy & Geophysics published a piece I wrote in 1998 critical of the pro-ETI position. They have a long history of giving a balanced platform (originally known as the Quarterly Journal of the Royal Astronomical Society) for intellectual debate on the ETI question; this has no counterpart in the U.S.
Perhaps the single most influential criticism of the pro-ETI position in the U.S. was just published in
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