Wednesday, March 17, 2010
Size comparison between Earth and Mars
Then there is the Hellas Basin in the southern hemisphere, which is an enormous impact crater 2300 kilometres in diameter and more than nine kilometres deep.
But perhaps most striking of all is the general difference in height and surface roughness between the northern and southern hemispheres. The northern hemisphere is smooth and flat and on average six kilometres lower than the rugged highlands of the south.
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