yes
reality
Ununoctium exist as an artificial chemical element.
Of course not.
Ununquadium is an artificial chemical element.
in reality they don't exist, but are parallel universes
Spongebob Squarepants is a fictional character and does not exist in reality.
of course not
"be" - To exist in actuality, have life or reality.
Do not exist.
ANything that can't be tested and is not falseifable ( example the supernatural, it exist as a concept but cannot be proven in reality) is beyond the reality of the universe. If it is unkown it is a unkown until you can prove it.
To study reality.