There's a big problem with the idea of ancient oceans on Mars: if they were contained within the 'shoreline' visible today, sea level would not have been level. Could it be that Mars has since tipped over?
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Zuber, M. Mars at the tipping point. Nature 447, 785–786 (2007). https://doi.org/10.1038/447785a
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DOI: https://doi.org/10.1038/447785a
