This question has been debated for centuries.
Gen.1:1 states, "In the beginning God created the heaven and the earth." In verse 3 we see "And God said, Let there be light: and there was light." Then in v26 we read, "And God said, Let us (the Trinity) make man in our (the Trinity) image, after our likeness (Father-Son-Spirit/body-soul-spirit) and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth and over every creeping thing that creepeth upon the earth." Then in the next verse He gives man dominion over the earth. In 2:21-23 God takes a rib from Adam, creates a Woman (female) and presents her to Adam. Then in 3:20 we see, "And Adam called his wife's name EVE; BECAUSE SHE WAS THE MOTHER OF ALL LIVING."
Man continues to search for life on other planets for the most part, to prove the evolutionary theory. True, there is life in our universe, but not life as we know it. Romans 8:38; Eph. 3:10 and 6:12; Col.l:16 and 2:15 all speak of "principalities", "powers" and "dominions" which move about in the heavenlies. In fact, Satan is called by Jesus in John 12:31, 14:30 & 16:11 "the prince of this world." Ephesians 2:2 states in part, "according to the prince of the power of the air..."
There is no doubt that the first and second heavens are occupied and are traveled by the spirit world, both holy angels and unholy angels which are demons, referred to as "devils" in the Bible. Then why did God create all these vast numbers of stars? Surely they don't just sit there unoccupied? Surely, there is intelligent life out there somewhere?
First of all, "The heavens declare the glory of God; and the firmament (earth) sheweth his handywork" Psalm 19:1 God created them all to bring glory to Himself. What an awesome God!
Secondly, in the Bible there is a relationship between the stars and angels. In fact, sometimes angels are called "stars". Sometimes "hosts of heaven" can mean stars or angels. There is obviously a connection. Finally, It doesn't fit with the plan of Scriptures for God to create other worlds of intelligent life which can never be redeemed. 1 Peter 3:18 states "For Christ also hath once suffered for sins, the just for the unjust, that He might bring us to God, being put to death in the flesh, but quickened by the Spirit." Romans 6:9 states: "Knowing that Christ being raised from the dead dieth no more: death hath no more dominion over Him." v10 "...He died unto sin once:".