How do we know things don’t just get infinitely smaller? If a quark is the smallest particle we know of, what makes up a quark? And so on?

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It also makes me wonder if everything is actually the same? I know it’s a silly question, but are all quarks the same (composition wise) if so, does that mean that at our smallest core, we are made up of the same thing? Does this also mean that if not, that there is always going to be variance even to our smallest level? I suppose this question is asking more about what exactly is the composition of the smallest possible particle, and is there really an end?

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There are two types of quarks and three generations of each type. We only see the up and down quarks normally, the higher energy versions, like the charma and strange decay, and the top and bottom are even higher energy. So all matter is made up of up and down quarks. 2 ups and a down make a proton, and two down and an up makes a neutron. Electrons are elementary like quarks.

As far as we know quarks aren’t composed of anything. Same as electrons and photons, they are elementary

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