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The rocky planets
The four planets closest to the Sun are: Mercury,Venus, Earth, Mars
These are called the 'rocky' or 'terrestrial' planets. They are small by planetary standards and made of similar materials to the Earth.
The gas giants
The next four planets are: Jupiter, Saturn, Uranus, Neptune
They are known as the 'gas giants'. They all have rings and lots of moons. The gas giants are made up mostly of hydrogen, helium, frozen water, ammonia, methane, and carbon monoxide.
Pluto
Pluto is a tiny rocky body at the edge of the Solar System. Some people think it's a giant comet rather than a planet. Its composition is similar to a comet (ice and rock). But its orbit is different from the other comets and planets.
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