The Bible doesn’t discuss this topic in any shape, form, or fashion.
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Unless you read the most popular book during the centuries before it was canonized: The Book of Enoch.
If you include the book of Enoch then a lot of the UFO stuff makes sense.
I think these things have been here since the beginning and it’s going to come down to something as simple as good vs. evil. I don’t think they have mans interests at heart.