Originally Posted by SmokingPlatypus
An atom is not the smallest thing. Atoms are composed of electrons, neutrons, and protons. But we can't stop there, can we? Electrons, Neutrons, and Protons are further composed of gluons, quarks, and nuons. But what is beyond there? Nobody knows, because we currently don't have instruments that can squint that far yet.
Furthermore, a universe isn't the biggest thing ever, either. Even if you have a universe, there has to be something beyond the universe, right? Or would it be that reality stops where the universe stops? Could the universe have an end? We don't know. Once again, we currently don't have instruments that can squint that far yet.
It's a fun thing to think about.