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Carl Sagan popularized Cornell prof Frank Drake's famous equation for calculating the estimated number of advanced civilizations in our universe which have survived technology well enough to begin space exploration.
The interesting dichotomy in that equation concerns UFO's here on earth. If there are millions of advanced technological civilizations out there, then what is happening here on earth is very commonplace across the universe and therefore unworthy of any scientific study from all these UFO's we seem to keep getting.
In order for developments here on earth to be of any major interstellar interest, then that implies that we are rare. And if we are rare, then it would be extremely unlikely that one of the few other advanced technological civilizations would have the blind luck to stumble upon us.
Neither point is a very convincing argument for the people who believe we are being visited frequently from "beyond."
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Living is easy with eyes closed.
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