Bible says there are other beings in other planets. First we should understand little basics on interpreting Bible Prophecies.
Figures always have a figurative meaning, and are used much in prophecy to represent future times, and events; such as mountains. meaning governments; beasts. meaning kingdoms; waters. meaning people; lamp. meaning Word of God; day. meaning year (Daniel 2:35, 44; 7:8, 17; Revelation 17:1, 15; Psalm 119:105; Ezekiel 4:6).
Knowing this first, that no prophecy of the scripture is of any private interpretation. 2 Peter 1:20
For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little Isaiah 28:10
Seek ye out of the book of the LORD, and read: no one of these shall fail, none shall want her mate: for my mouth it hath commanded, and his spirit it hath gathered them. Isaiah 34:16
Bible says Angels and beings from other planets were witnessing creation.
When the morning stars sang together, and all the sons of God shouted for joy? Job 38:7
Who is this morning stars and sons of God?
As per below verses the stars are angels.
And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born. Revelation 12:4
The mystery of the seven stars which thou sawest in my right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches: and the seven candlesticks which thou sawest are the seven churches.Revelation 1:20
Now the sons of God should be beings other than angels.
Now there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them. Job 1:6
This I believe to be a representation of beings from their planets.