A few months ago, Nightline featured a cosmologist who said basically that the idea that we are all there is (as far as life goes) should be given due consideration. Even if there is life elsewhere in the Universe, it's an unimaginably big place and if it's so far away we'll never know about it, it's effectively nonexistent. Still, with incredibly sensitive listening devices, operating for many years, we've never heard a signal organized enough, and yet with sufficient complexity, to be attributable to intelligent life outside our planet.
Reports of alien aircraft flying alongside our own? Well, I met some people once who claimed they were from Mars. They said it had a red atmosphere and fields of grain. What am I saying? You can't believe something merely because someone reports it. You need independent verification. Today, we know that Mars has no substantial surface life, and certainly no fields of grain.
As for reports of alien spacecraft operating in our atmosphere, it begs credulity to suppose that these craft (often seen in groups and formations) don't communicate with each other. The most likely form of communication being radio communications of some sort...and yet while we "see" these craft, we never seem to hear them, raising the possibility that what we see is either imaginary or illusory.
Personally, I have two computers running the SETI@home program, so I'm helping to find any evidence of extraterrestrial life, and I hope we do, but I really don't expect it to happen in my own lifetime, or ever.
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