“Atom” is the name we give to an, in some ways arbitrary, level of magnification under which we describe how ‘energy’ behaves. An atom is not a ‘thing’ in the way we imagine, it is much rather a system of predictable and universal behavior.
The reason we’ve picked these kinds of behaviors and their interactions as fundamental is because they appear to be just that.
So, atoms must be the same across the universe, because that’s one of the reasons we use this kind of model in the first place.
Other ideas and systems could be devised (and have been devised) to talk about the rules of reality on that level, but if they were only applicable, say, on earth, they would be much less useful.
Latest Answers