Unless the “experts” have confirmed that the universe is finite and does not extend forever (which would logically mean there is some boundary or “outer wall” surrounding it) then there must be an infinite number of atoms in the universe.

However if there were an “outer wall” surrounding the universe, then logically speaking there would have to be either 1) something, or 2) nothingness, on the other side of that wall. Since “nothingness” is the same thing as “more outer space”, that means the universe must extend infinitely, which then means there is an infinite amount of space in which additional matter may or may not exist, which then means it’d be impossible to quantify the number of atoms in existence...?

Very tough math problem imho,