Sure, there’s so much we don’t know.
Personal experience matters; I’ve seen “ghosts” but not UFOs.
So I believe in one and not the other.
The only sure-fire ghost I’ve seen- it could have only been a ghost- was on my way to work at 4:30am going down H3 Interstate in Hawaii which has a wide grassy median.
I wasn’t driving too fast, but slowed down even more when I saw what looked like a man -kind of lit up - about 100 yards from me walking uphill on that median. I kept looking at him, and as I got closer I could see him so clearly.
He looked like he was 90 years old, all dressed up in a black suit, white dress shirt and black tie and black tophat walking with a cane uphill. His eyes were ablaze looking straight ahead, taking no notice of any passing cars. He looked like he was determined to get someplace. There was an aura around his whole body.
There is nothing for miles and miles on that interstate. There was no place for him to go. I didn’t see any broken down cars. But when I looked back after passing him; he was gone . . disappeared.
I have also seen that light in a friend’s eyes hours before he passed away. His body weak, but his eyes looked alive and in a blaze. A light was dancing in his eyes.
I’ve also had a healing visitation from some light energy that I may post later.
I’ve also felt the presence of a loved one that had passed. I could feel his touch.
But as for seeing a “ghost” that was the only time on H3 interstate.
Bet you didn’t know Hawaii has interstates ha ha.