If God, angels and fallen angels fit into your equation, then sure the bible supports the idea of life operating somewhere else besides Earth. (Though there is a lot not told/revealed to us yet for reasons God knows. But we will know as we are known one day, as the bible says. Whether through Yeshua's coming or our home going.)
Living beings/angels/sons of God in the heavens
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One term used is heavenly hosts:
Genesis 2:1
( Thus the heavens and the earth were finished, and all the host of them. )
Nehemiah 9:6
( Thou, even thou, art LORD alone; thou hast made heaven, the heaven of heavens, with all their host, the earth, and all things that are therein, the seas, and all that is therein, and thou preservest them all; and the host of heaven worshippeth thee. )
Isaiah 45:12
( I have made the earth, and created man upon it: I, even my hands, have stretched out the heavens, and all their host have I commanded. )
Luke 2:13-14
And suddenly there was with the angel a multitude of the heavenly host praising God, and saying,
Glory to God in the highest, and on earth peace, good will toward men.
Hosts(Used to refer to armies also)
Isaiah 34:2
Deuteronomy 20:9
Psalm 68:12
Lord of hosts
1 Samuel 4:4
2 Samuel 6:2
Isaiah 6:3
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I remember reading a book by Billy Graham when I was about 17. He discusses this very issue of such sightings and proposed some may be angels and gives some example stories. One interesting point he made was related to the fact the Earth, the Heavens and many things we see around us look completely different depending on the spectrum of light you observe them in. We don't see it right away because our eyes see in the a certain light spectrum. Some ordinary rocks dazzle when seen in other light. In similar way, such heavenly being and their world operations are always going on around us, we just can't see it. A great example being Elisha praying that the eyes of a young man may be opened to see the angels:
2 Kings 6:16-17
And he answered, Fear not: for they that be with us are more than they that be with them. And Elisha prayed, and said, LORD, I pray thee, open his eyes, that he may see. And the LORD opened the eyes of the young man; and he saw: and, behold, the mountain was full of horses and chariots of fire round about Elisha.
And I guess it's worth mentioning here the time Elisha witnessed Elijah being taken up in a fiery chariot, just to make the point that heavenly beings use 'chariots'(though their existence, as described in the bible, appears to not totally require chariots to travel in the heavens.....as in majority of sci-fi media where they usually travel via space ships. If man can make ships to fly in space, God can create creatures to do the same, and way more advanced):
2Kings 2:11-12
And it came to pass, as they still went on, and talked, that, behold, there appeared a chariot of fire, and horses of fire, and parted them both asunder; and Elijah went up by a whirlwind into heaven. And Elisha saw it, and he cried, My father, my father, the chariot of Israel, and the horsemen thereof.
If the people during those time had smart phones with camera's, I wonder if they would have recorded something similar to the following links (though,not saying the following are valid, but possible):
https://www.youtube.com/watch?v=0GeIImbZpCo (Note- Has some profanity from soldiers as they observe lights(vertical streaks) in sky using night vision.
https://www.youtube.com/watch?v=-_ilZFV7ZSM
