Mars has a north–south divide in the age of its surface, as judged by the density of impact craters. Altimetry data, which by inference provide a subsurface view of the planet, reveal that the divide is only skin deep.
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H. V. FREY AND J. H. ROARK
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Solomon, S. An older face for Mars. Nature 418, 27–28 (2002). https://doi.org/10.1038/418027a
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DOI: https://doi.org/10.1038/418027a
