Several of the planets have smaller objects orbiting them called moons. The Sun and everything around it make up the Solar System. There are also countless smaller bodies which are left-overs from the formation of the Solar System. Asteroids are chunks of rock which range in size from tiny grains of dust to one almost a thousand kilometres across. Many are found in a belt between the orbits of Mars and Jupiter, but there are others throughout the Solar System.
Comets are icy bodies which grow long tails of gas and dust when they come near the Sun.
At the very edge of the Solar System, about one light-year from the Sun, we believe there is a cloud of icy comets, called the Oort Cloud . Between Pluto and the Oort Cloud is a region called the kuiper belt, only reccently discpovered to be the home of rocky, icy moon-like objects. Some astronomers believe Pluto and Charon, the moon of Pluto, to be examples of these. Once again, we have exaggerated the scales in this diagram - at this distance we would not see the planets, moons, comets or asteroids. We would only see a bright star, our Sun.