Earth compared to Mars

Earth compared to Mars

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Credit: MARK GARLICK/SCIENCE PHOTO LIBRARY

Caption: Computer artwork comparing the size of Mars (left) with that of the Earth. Mars' diameter is 53% that of the Earth's. It has ten percent the mass of Earth and is, on average, 1.53 times further from the Sun. While the Earth is host to oceans of liquid water and has a relatively dense water-rich atmosphere, Mars is exceedingly dry, cold and, as far as we know, sterile. It is thought to have lost most of its water to space a long time ago, and any that remains is frozen at the poles and locked deep in the ground as permafrost.

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Keywords: astronomy, comparison, earth, mars, planet, size, space, telluric, terrestrial

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