Yes, exactly. At low energies we can see that most of the atom's mass is in a nucleus. At medium energies we see that there are proton and neutron sized lumps i

Yes, exactly. At low energies we can see that most of the atom's mass is in a nucleus. At medium energies we see that there are proton and neutron sized lumps in the nucleus. At very high energies we can see that the protons etc have quark sized lumps inside them. (Full disclosure: FWIW I took a physics course from one of the professors on the team which discovered gluons.)