It's entirely probable that there is other life out there in the universe.
The Odds That We’re the Only Advanced Species in the Galaxy Are One in 60 Billion
(airspacemag.com)
As for ghosts or the paranormal?
I think there's a rational explanation for the phenomena that people experience that's more than just telling them what the they saw wasn't real.
Lots of people who worked in my grandfather's store said they saw/heard things after he died. Someone locked my co-workers in the cool room when there were only three of us there, and it wasn't me.