English: This image is a hand mnemonic used to help students learn the Solar System. The fingers of the left hand represent the terrestrial planets. The fingers of the right hand (palm upward) represent the gas giants, with Saturn as the ring finger. The left thumb shows the sequence of the dwarf planet Ceres among the asteroid belt. The right thumb indicates the dwarf planet Pluto along with other trans-Neptunian objects. (To represent the Sun, the hands could be positioned in relation to the head or some other object.)

With the fingers and thumb taken together, the left hand represents the Inner Solar System and the right hand represents the Outer Solar System. Moons and ring systems for each planet and dwarf planet are indicated in red. The total number of moons is broken out into two sets, with the first being the number of large moons that have been rounded by hydrostatic equilibrium, and the second number being the remainder of known moons that are not in hydrostatic equilibrium. By analogy to planets, this split could be considered as separating "major moons" from "minor moons". Sets of parentheses indicate major and minor ring systems, and are exclusive to the gas giants.

Uranus stands out because while the names of Roman gods are used for other planets and the two dwarf planets shown, Uranus is Greek (Roman equivalent is Caelus). Solar system objects not represented include other asteroids (including Jupiter's Trojans and near-Earth asteroids), comets and cis-Neptunian objects (including Neptune's Trojans and centaurs).

Most people have a grossly distorted understanding of the sizes and distances of planets in the Solar System, as nearly all depictions are done by compressing the space between planets by several orders of magnitude. Here is a photo that gives an accurate scaling, where objects representing the planets are held in the palm of a person's hand while the Sun-Neptune distance spans the full length of a football field:
File:Planets and sun size comparison (inset scaled to football field).jpg

For an excellent presentation of the major moons in the Solar System, see this image (from lesud.com).