The Bible does teach about aliens in space. Satan fell from heaven Isaiah 14:12, and when he did, out of the third heaven of II Corinthians 12:3, he became the god of this world's systems, II Corinthians 4:3-4, and the one who controls heavens 1 and 2, he's the prince of the power of the air, Ephesians 2:2. When he fell, he took one-third of the angels with him. Revelation 12:4 and these wicked fallen angels now control space. Thats why Ephesians 6:12 we wrestle not against other human beings, but against principalities and powers and spirits and against evil demonic beings in high places.
There is going to be a war in heaven in revelation 12:7. There was war in heaven, Michael and his angels, (good), fought against the dragon, which is Satan, Revelation 20:4. Satan is defeated and cast out of heaven. Verse 12 says, Woe to the inhabitants of the earth and sea because the devil has come down on you having great wrath because he knows he has but a short time. He may be surveying his territory.
Lets go to the good angels for a minute. Elijah was caught up by a whirlwind to heaven, II kings 2:11, but search it out and go back to the chapter. Angels in chariots of fire came after him. Ezekiel chapter 1:4 indicates the angels of chariots of fire cometh out of the north in whirlwind fashion and Gods throne is in the sides of the north. They appear as men, verse 5. They travel like lightning verse 14 and the color of ships happen to be beryl. Our astronauts go into space ships that contain beryllium because it can withstand the heat as they go through space. Now Elijah went to heaven in a whirlwind. Angels came to get Lazarus, Luke 16:22 and as we go up in a twinkling of an eye an angel is transporting us home, Hebrews 1:14.
There is life out there but it is angels, good and bad.
We have a guardian angel that escorts us in the presence of the lord.
Every believer has his own personal angel, Hebrews 1:14. Are not the angels ministering spirits, sent forth to minister to them who shall be the heirs of salvation. Now we get instant salvation when we receive Christ.
It all happens in a twinkling of an eye, I Corinthians 15:52, so it can only be angels taking us there when we hear the shout, Come up hither. We travel like lightning or the chariots do.
Satan is powerful, but he is not all-powerful. We serve a living God who is all-powerful. One-third of the angels fell from heaven with the dragon in Revelation 12:4, and they are now controlling the heavens as principalities, powers, and rulers of the darkness of this world and spirit wickedness. This is an array of military titles all the way from four star generals to buck privates so they can relay messages about you to Satan because he is not all-knowing. They have to tell him what is going on here on earth. Satan, of course, loses in the battle of Revelation 12:7-13, and he is cast into the lake of fire, Revelation 20:10 when Christ returns.