One last thought aliens and angels...
By the way, if you haven't picked it up by now, I believe that sometimes humans call angelic encounters alien encounters. I think that sometimes we try to explain the unexplainable. For many people it is easier to believe that there is life on another planet than to believe that there is supernatural life.
Why do we always assume that aliens are smarter, more advanced than humans? If there are aliens on other planets, why must they be savvy, wise and established than we? Is it possible that we are the most advanced? Isn't it conceivable that we are closer to finding other life forms than they are to finding us?
It seems to me that science fiction always depicts the aliens as aggressive and superior in strength and intellect to we humans. We are constantly defending ourselves and living in fear. (Part of this may be explained as a natural balancing. We- established, wealthy, western-Europeans- have always been the more advanced and aggressive. We have enslaved, diseased and displaced numerous people groups. Perhaps our fear is a sort of emotional karma.)
I would like to propose that if there is life "out there" it is just as likely that we have the technological advantage. We may very well be the most advanced and superior of the millions of life forms in the universe. It makes a better story to be on the defense, but if we are imagining what may be, we need to be reasonable and find balance. The odds are not stacked against us. We may very well be #1.