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Well, no one can really be sure of it. I mean, even if there are aliens out there, whose to say that they're smarter than we are and can create spaceships. They may just even be another race of humans. Maybe about three centuries or so ago, the N.A.S.A. program created a rocket to go to an unknown planet and it crahsed and they were to embarrassed to tell the world about it, and while they thought that the people on the ship died, they had actually landed on a planet with good oxygen levels and lived and forgotten about the whole incident and are living just like us wondering if there are other races out there. And why does everyone assume aliens are green, anyway? My point is, there's no way of knowing. For all we know, the aliens to us could actually be less technalogiclly advanced than humans. They may even be living in olden times like King Aurther!
I don't think the rapture is anywhere near, just yet. Suffice it to say, we have probably already made contact and just don't recognize it yet. They are out there. :)