Quarks: What are they? | Space

Quarks are the ultimate building blocks of visible matter in the universe.

If we could zoom in on an atom in your body, we would see that it consists of electrons swarming in orbits around a nucleus of protons and neutrons. And if we could zoom in on one of those protons or neutrons, we’d find that they themselves are made up of a trio of particles that are so small that they have almost no size at all, and are little more than points. These point-like particles are the quarks.

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