I apologize in advance to experts for the naivety of the question. It should be a duplicate but I didn't find any satifying question or answer about that.
The proton is composed by two up quarks and one down quark.
mass(proton) ∼940 MeV/c2
mass(up) ∼2.3 MeV/c2
mass(down) ∼4.8 MeV/c2
It follows that: 2mass(up) + mass(down) ∼9.4∼1100 mass(proton).
Question: Where does 99% of the remaining mass of the proton come from?
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