If you are going to start saying and relying on statements like...
"the bible doesn't say" or "He never said".... then the sky is the limit and you can let your imagination run wild.
Do you think that God would not inform us of things of this magnitude..... and then, knowing that we did not know or were not informed, allow us to have awareness of it? Like He could even say," well you weren't supposed to find that out"....
Seriously, this is just man made, man dreamed, man assumed scenario's which are in place to explain the events that are basically super natural inter-dimensional beings.
Again, it is Satan's deception and Satan's lies that seeded these false scenario's in the minds of men. All with the purpose of detracting from God's truth.
Satan wants you to believe that God is not real, Satan is not real, the bible is wrong and, now , there is other civilization on other planets. None of which is biblical.
Jesus said, in one of His explanations as to why His statements were true....."If it were not so, I would have told you".
Why would He tell us such a thing about one of His truth's and then not tell us about another?
John 14:2 King James Version (KJV)
2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
Some may say that this is a weak argument. They may be right. But the argument that says "it doesn't say He didn't" is also weak and leaves an infinite number of scenarios to be presented.