CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Structure of matter. Computer illustration representing the Standard Model of particle physics. Shown here are an atom (left) composed of electrons (yellow) orbiting a central nucleus, which is itself composed of protons and neutrons (red and white, centre), and a single proton (right) composed of three quarks (purple).
Model release not required. Property release not required.