Fermilab

The top quark

As its name states, the top quark is a quark. Quarks are one of the fundamental building blocks of which the entire universe is constructed. Scientists know of six different quarks, although only two of them (the up and down quarks) are found inside the protons and neutrons at the center of atoms. The other four quarks (strange, charm, bottom and top) are all unstable and decay in fractions of a second.

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