We used to think that atoms were the fundamental particles, made up of nothing smaller, but then we discovered the concept of sub-atomic particles who themselves were now fundamental, but now it has been concluded that quarks make up all of these and they themselves are indivisible. Each time we were wrong and the particles could be broken up smaller and smaller, how do we know this time for sure that quarks are fundamentak?
In: Physics
We don’t. That’s where one of the string theories comes into discussion as hypothetical possibilities in some multidimensional math, but, we have no evidence of there being such a thing. Also, our current model, the Standard Model, is very good at making predictions that describe the observations we make.
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