What current theories? Wikipedia?
Well, it is actually impossible to know for absolute certain the exact number of atoms in the known universe. Wikipedia is usually fairly reliable. I could find more credible sources for you but why don't you find a credible source that shows me I am wrong instead. That way I don't have to do all the work and you won't have quite as much time to complain about other peoples sources.
What current theories? Wikipedia?
unworthy