@Richard Plinston
"And what is it that you have done to be able to claim a superior 'right' to state your opinion as if it were fact."
A similar statement could be made for a variety of the people in this thread, none of whom can claim a "'right'" to state an opinion not merely not contradicting but even judging Buzz Aldrin's opinion. But tell me the "evidence" (in the strictest sense of "facts") which is accessible to Buzz but not to the original poster and not to the other posters here, that would invalidate any opinions conflicting with Buzz Aldrin's opinion.
What you don't seem to realize is that science is not some sort of "democratic" process where science is determined by vote; nor are facts subordinate to appeals to Buzz Aldrin's authority - which, in this case, seems to scarcely exist.
There are two facts and only two facts in this matter:
1) The universe is immense, and
2) There are no evidence of life existing anywhere else in it.
That's all there is. It's got nothing to do with Buzz Aldrin, no matter how much you want to rely on his opinions.
Might there someday be evidence? Well of course. But we don't have it yet. But if you want to rely on evidence that might, one day, exist, what do you need science for at all?