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The diameter of Mars is only 6,786 kilometers, which means it is about half the size of Earth. Mars is covered in a thin coat of iron oxide, which is what gives it its reddish color
http://answers.ask.com/Science/Astronomy/what_is_t...
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Mars' diameter is about half that of the Earth and it's mass is only 10% of the Earth's. The total surface area of Mars is about the same as the total land area of the Earth.
http://wiki.answers.com/Q/What_is_the_size_of_Mars...
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With a radius of 3396km, the planet Mars is about the same size as the inner and outer core of the earth (which is around 3490km radius in total).
http://wiki.answers.com/Q/What_is_the_same_size_as...
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uranus
http://wiki.answers.com/Q/What_planet_is_the_same_...
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