PerspectivePlanetary Science

A Liquid Core for Mars?

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Science  11 Apr 2003:
Vol. 300, Issue 5617, pp. 260-261
DOI: 10.1126/science.1083626

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Early in their evolution, both Earth and Mars must have been sufficiently hot to be molten. Earth still has a liquid core, whereas the smaller Mars, having cooled faster, could be completely solid today. But is it? In her Perspective, Dehant highlights the report by Yoder et al., who have analyzed long-term changes in the orbit of Mars Global Surveyor around Mars. The data suggest that at least part of the martian core is liquid, with important consequences for the interior and evolution of our neighboring planet.