The particles that are in an atom: protons, neutrons and electrons The particles that are in protons and neutrons: quarks The four fundamental forces: gravity, electromagnetism, the strong force and ...

They're called ghost particles for a reason. They're everywhere—trillions of them constantly stream through everything: our ...

Physicists at the ATLAS detector of the Large Hadron Collider (LHC) have spotted top quarks — the heaviest of all known elementary particles — that were produced by the collision of atomic nuclei 1.