Planetary data for Mars

Mars is the second smallest planet in the solar system, after Mercury. Its diameter, or distance through its center, is about 4,224 miles (6,800 kilometers). That is about half the size of Earth’s diameter. Mars has layers like Earth’s. These layers consist of a metal core; a thick, rocky middle; and a crust.

The surface of Mars consists of rock and dust. There are many large dust storms. Parts of the…

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