How does the size of Mars compare to Earth?
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Mars (diameter 6790 kilometers) is only slightly more than half the size of Earth (diameter 12750 kilometers). Note the difference in color between the two planets. Almost 70% of Earth's surface is covered by liquid water. In contrast, Mars now has no liquid water on its surface and is covered with bare rock and dust.
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The size of Mars is compare to earth by the calculation of the area inside by given radius ...and for size calculate the mass of earth wrt Mars but from the radii difference it is very clear to know the size difference between them
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