Quark

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Quark, kwawrk, is one of the three families of particles that serve as "building blocks" of matter. The other two families are the leptons and the fundamental, or gauge, bosons. Quarks are elementary particles--that is, they have no known smaller parts.

Muon

Muon, MYOO on, is a type of elementary particle that closely resembles an electron but has a greater mass. An elementary particle does not consist… See more »

Baryon

Baryon, BAR ee on, is a unit of matter smaller than an atom composed of three still smaller particles called quarks. A baryon is one of two types… See more »

Shadow matter

Shadow matter is a hypothetical form of matter that is thought to interact with ordinary matter only through the force of gravity. If shadow matter… See more »

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Quark

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