(physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3
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Even though atoms and their component parts are incredibly tiny, it's impossible to understand the biggest things in the universe —stars, nebulas, and galaxies — without knowing how these invisible particles behave and interact. Up and atom!