It is mainly made up of iron. There is no atmosphere on this planet. It is named after the Roman messenger god. In mythology, the god was known for being quick – this planet is the fastest of all the planets to orbit the Sun, because it has
Mercury
This planet appears to be the brightest planet in the sky due to the reflection of the Sun from its clouds, and its closeness to Earth. This planet is almost the same size as Earth, but other than size the two planets are very different!
Venus
Temperatures on this planet are very similar to temperatures on Earth. It is believed that this planet once had water on its surface. Its surface is covered in red dust. It also has two small moons.
Mars
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