It will be interesting, I am not a believer in UFOs. After our encounters with a certain bunny, we Martians stopped coming.
There are two life form possibilities for UFOs. One is a group of beings that live on earth. It seems unlikely their ability to avoid detection would be very low.
The other are aliens from space. There are two things that make me skeptical. One, SETI (I tasked a couple dozen PCs to SETI back in the day). We did find one signal from Proxima Centauri a couple months ago that might be a sign of something. But last I heard it had a whole lot of tests to go through yet. If there are aliens here, we are not at all picking up their conversations back to home.
Proxima Centauri is important, it is our closest star. If faster than light is impossible as our current thinking believes, there are not many stars likely to send expeditions to earth. Proxima is 4.4 light years or so away. At .75 the speed of light, very far past our ability, we are talking over a 5 year journey. That is the closest.
Proxima has a planet in the Goldilocks zone. But we believe the huge amounts of radiation from its star would make life unlikely.
As we get further away, the difficulty in getting here goes way up. The ability to send multiple ships from 20 light year's is very incredible. Certainly not impossible, but it reduces the possibility below other options.
We know swamp gas has long been mistaken for ghosts and UFOs. There is a possibility that higher in the atmosphere there is a similar phenomena we do not understand