Planetary science: Mars at the tipping point

  title={Planetary science: Mars at the tipping point},
  author={Maria T. Zuber},
  • M. Zuber
  • Published 14 June 2007
  • Physics
  • Nature
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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