A
The RTB team, led by astronomer/astrophysicist Dr. Hugh Ross, tackled this question scientifically and published their results taking care to normalize them with the Christian worldview (and doctrine) which you can read here:
Lights in the Sky & Little Green Men: A Rational Christian Look at UFOs and Extraterrestrials: Hugh Ross, Kenneth R. Samples, Mark Clark: 9781576832080: Amazon.com: Books
The twelve-part RUFO video series can be found here:
1. https://youtu.be/D8vGzOProVY
2. https://youtu.be/0Z8C0HTHYJY
3. https://youtu.be/sEQbZAh1erg
4. https://youtu.be/ty3bja1u-f0
5. https://youtu.be/D0uJrpojd44
6. https://youtu.be/sGOTmfnFl5Q
7. https://youtu.be/UeNF0NafeJ4
8. https://youtu.be/NaZt3iTXna8
9. https://youtu.be/T6AuUtoZBUU
10. https://youtu.be/RHMaWTtn6ZY
11. https://youtu.be/qHqzzTJYZOo
12. https://youtu.be/7e7kQ3Pp2eY
Lights in the Sky & Little Green Men: A Rational Christian Look at UFOs and Extraterrestrials: Hugh Ross, Kenneth R. Samples, Mark Clark: 9781576832080: Amazon.com: Books
The twelve-part RUFO video series can be found here:
1. https://youtu.be/D8vGzOProVY
2. https://youtu.be/0Z8C0HTHYJY
3. https://youtu.be/sEQbZAh1erg
4. https://youtu.be/ty3bja1u-f0
5. https://youtu.be/D0uJrpojd44
6. https://youtu.be/sGOTmfnFl5Q
7. https://youtu.be/UeNF0NafeJ4
8. https://youtu.be/NaZt3iTXna8
9. https://youtu.be/T6AuUtoZBUU
10. https://youtu.be/RHMaWTtn6ZY
11. https://youtu.be/qHqzzTJYZOo
12. https://youtu.be/7e7kQ3Pp2eY
With the universe literally having billions upon bullions of galaxies which in turns have billions of stars, you could argue that statistically life might also be on other planets and in different forms. If you think that this is possible, or even likely, how does Christian doctrine apply there.