The Bible does not specifically comment about life on other planets. Will God create extraterrestrial life? Perhaps. God creates nothing in vain. Respecting the creation of earth, Isaiah wrote, “For thus says the LORD, who created the heavens — He is the God who formed the earth and made it, He established it and did not create it a waste place, but formed it (the earth) to be inhabited…” (Isaiah 45:18)
Stars and planets may have different uses other than to directly support life. We do not know God’s will. “For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD.” (Isaiah 55:8)
However, the activity of the experience of evil is limited to our planet. It is not God’s design to promote the spread of evilness to other planets through contact with earth. Therefore, supposed alien contacts are created by fallen angels.
Evil behavior everywhere will be eradicated by the end of Christ’s 1,000 reign. 1 Corinthians 15:24-25 (NIV), “Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all (opposing) dominion, authority and power. For he must reign until he has put all his enemies under his feet.”
God designed to permit evil only on earth. Even before creation, God had planned the remedy for man’s release from sin’s consequences. Jesus was the lamb slain, “foreordained before the foundation of the world,” 1 Peter 1:20. The remedy will be revealed to all during Christ’s reign. Then all will be resurrected and given the opportunity to be healed spiritually, mentally, and physically, if they choose to obey God’s will. (See Isaiah 35.) Possibly, in the ages after the 1,000 year reign, man might have contact with other holy, extraterrestrial beings. The Bible does not address this.
For a more detailed study about the permission of evil, please download the free PDF: "Why God Permits Evil"