I don't doubt that you saw something unusual and inexplicable in the late 60s, LH. And I suppose that there's a possibility that you could have seen an alien craft. But without further data any guess as to what it was that you saw must remain just that - a guess.

On the other hand, given the number of stars in our Galaxy (about 200 billion I think?) and the number of galaxies in the Universe (a similarly enormous number) then the chances that there are no other intelligent species 'out there' are, I would have thought, rather small - especially as we now have scientific evidence for planets orbiting other stars.

But we also have scientific evidence to suggest that interstellar travel is enormously difficult and may actually be impossible.

Nevertheless, an alien civilisation may have overcome the problems posed by interstellar travel and, for all I know, may have even visited us. But if they have I must repeat the questions I posed on this thread last year, and that is: why have the aliens only revealed themselves to ordinary Americans and Canadians who have usually been travelling at night on country roads when the encounters occurred? And why have such auspicious encounters been free of any lasting consequences for the rest of us?