Ok I'm back. I've been thinking on this and I have a few points.
1. We need to be careful of assumptions.
2. The Bible may contain 'clues' about aliens and life outside this planet.
I'll start with 1. Watch your assumptions
People may assume many things about intelligent life existing on other planets. They may assume it invalidates Jesus or they may wonder about things like doing missions to other planets. They may wonder what happens if these intelligent beings have never heard of Jesus!?
Well if these beings do exist, maybe they're just like any other creature that exists on Earth. There are many intelligent beings on our own planet, quite capable of many things, yet they aren't created in the image of God, so we don't really think much of it.
It's quite possible that if life on other planets exists with what we call 'intelligent' life, it's quite possible they're on the same level of existence as dolphins or ants or whatever. Just because they can build a spaceship doesn't mean they have the same value as humans created in God's image.
So if these things exist, I wouldn't sweat it much. I wouldn't view them as any different than a dolphin or ant or whatever.
Now to number two. There may be clues scattered in scripture to give us hints about aliens and spaceships and all that.
Right out of the starting gate we're told that God created stuff way beyond this Earth.
Genesis 1: 14 And God said, "Let there be lights in the expanse of the sky to separate the day from the night, and let them serve as signs to mark seasons and days and years, 15 and let them be lights in the expanse of the sky to give light on the earth." And it was so. 16 God made two great lights—the greater light to govern the day and the lesser light to govern the night. He also made the stars. 17 God set them in the expanse of the sky to give light on the earth, 18 to govern the day and the night, and to separate light from darkness. And God saw that it was good. 19 And there was evening, and there was morning—the fourth day.
People being mysteriously transported off this planet
Enoch - Enoch walked with God; then he was no more, because God took him away.
Elijah - 11 As they were walking along and talking together, suddenly a chariot of fire and horses of fire appeared and separated the two of them, and Elijah went up to heaven in a whirlwind.
How does God get folks transported from here to there? The Bible described it is a chariot of horses and a whirlwind in the case of Elijah. Maybe that's hint of some kind of interplanetary transportation systems out there?
Examples of odd creatures with intelligence.
*Creatures resembling a man with four faces and four wings. - Ezekiel 1:4-28
**Singing Seraphs Isaiah 6 2 Above him were seraphs, each with six wings: With two wings they covered their faces, with two they covered their feet, and with two they were flying. 3 And they were calling to one another:
"Holy, holy, holy is the LORD Almighty;
the whole earth is full of his glory."
* Odd animal like living creatures with many eyes who talk. Revelation 4
6Also before the throne there was what looked like a sea of glass, clear as crystal.
In the center, around the throne, were four living creatures, and they were covered with eyes, in front and in back. 7The first living creature was like a lion, the second was like an ox, the third had a face like a man, the fourth was like a flying eagle. 8Each of the four living creatures had six wings and was covered with eyes all around, even under his wings. Day and night they never stop saying: "Holy, holy, holy is the Lord God Almighty, who was, and is, and is to come."
Example of other spiritual beings coming before God.
*2 Chronicles 18: 20 Finally, a spirit came forward, stood before the LORD and said, 'I will entice him.'
" 'By what means?' the LORD asked.
So those might be some hints and clues. I know the list probably isn't comprehensive. Try doing some clue finding on your own and see what you find.
All together we do see people being transported somehow between Earth and some final destination. We do see God telling us there is more to creation than what's on this Earth. We see odd creatures with much intelligence. Intelligence enough to even talk and praise God. We even see some odd situation of various spirits who present themselves before God.
If life does exist, I wouldn't really get in a twist about it. Nothing dictates that it invalidates Jesus. Nothing dictates that they aren't on the same level as other animals.
Jesus is the ONLY remedy for humans made in God's image. The existence of 'intelligent life' won't change that.