Originally Posted by Gillianren

And that's where your scientific rigour fails you, I'm afraid. Because we don't know what a hypothetical alien spacecraft looks like and acts like, it should require more proof that whatever-it-is happens to be one, because otherwise, you're likely to assign "alien spacecraft" to things bearing no resemblance to one, regardless of what you think. It doesn't matter what you "believe" about the likelihood of alien visitation. It matters what you can provide evidence for. By putting a low standard of evidence to show the possibility of alien spacecraft, you're only hurting your cause every time it's shown that it was something else really.