A moon-sized celestial object that crashed into the south pole of Mars: ETH geophysicists have conducted a three-dimensional simulation that shows for the first time how the Red Planet came to have two different hemispheres. Mars has two differently shaped hemispheres: the lowlands of the northern hemisphere and the volcanic highlands (yellow to red regions) of the southern hemisphere. Credits: MOLA Science Team The two hemispheres of Mars are more different from any other planet in our solar system. Non-volcanic, flat lowlands characterise the northern hemisphere, while highlands punctuated by countless volcanoes extend across the southern hemisphere.
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