In the 1970s, physicists discovered that protons and neutrons are themselves composite particles, each containing three smaller particles called quarks—specifically two up quarks and one down quark in a proton, and two down quarks and one up quark in a neutron.
factualpending
Evidence Quote
“in the 1970s we learned that the protons and neutrons aren't fundamental either... inside each proton and neutron are three smaller particles uh that we call quarks”
Source
Quantum Fields: The Real Building Blocks of the Universe - with David Tong— The Royal InstitutionCreated: 8/10/2026, 10:55:31 PM
My Notes
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