Space Daily September 06, 2026 • 11:30

Despite being only about half Earth’s diameter, Mars has nearly as much total surface area as all of Earth’s continents combined—the difference is that oceans cover 71% of our planet, while modern Mars has no permanent bodies of liquid water. - Space Daily

Mars has about 97% as much surface area as Earth’s dry land, a geometrical coincidence created by the oceans covering most of the larger planet.

Mars looks small beside Earth. Its mean radius is about 3,390 kilometres, a little over half Earths, and its volume is only about 15 per cent as large. Yet if the whole Martian globe were unwrapped o… [+8611 chars]

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Despite being only about half Earth’s diameter, Mars has nearly as much total surface area as all of Earth’s continents combined—the difference is that oceans cover 71% of our planet, while modern Mars has no permanent bodies of liquid water. - Space Daily

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