This image is a picture demonstrating the scale from clusters of galaxies down to subatomic particles. This is a logarithmic scale, in powers of 10, corresponding to lengths in metres (m). The scale of galaxy clusters is shown as 10 to the power 22 m; a galaxy is shown as 10 to the power 15 m; a solar system as 10 to the power 12 m; the Earth as 10 to the power 4 m; a human implied as 10 to the power 1 m; a molecule as 10 to the power minus 5 m; a DNA helix as 10 to the power minus 6 m; an atom with three particles as 10 to the minus 9 m; a nucleus of an atom with electron clouds as 10 to the minus 12 m; a nucleus of an atom with protons and neutrons as 10 to the minus 14 m; and quark substructure as 10 to the minus 15 m.