Earth and Mars compared
The vast deserts of North Africa are no match for the planet-wide desert that is Mars. While the Earth is host to oceans of liquid water and has a relatively dense water-rich atmosphere, Mars is exceedingly dry, cold, and so far as we know, sterile. It is believed that Mars lost most of its water to space a long time ago, and any water that remains is frozen at the poles and locked deep in the ground as permafrost.
It is an interesting coincidence that the total surface area of Mars is about the same as the surface area of dry land on the Earth.
Mars surface map provided by USGS
Copyright © Walter B. Myers. All rights reserved.
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