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Origin of the Martian crustal dichotomy?

Origin of the Martian crustal dichotomy?

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© Don Davis. All rights reserved.

Origin of the Martian crustal dichotomy?
Geophysical modeling suggests that a Pluto-sized body may have slammed into Mars early in its history, erasing the cratering record of half the planet and leaving behind the low-lying, flat volcanic plains that now form the northern lowlands of Mars.

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