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<p>and crustal thickness. In some areas of Mars there is a correlation between gravity anomalies and topography.  Given the known topography, higher resolution gravity field can be inferred. Tidal deformation of Mars by the <a href="page.php?w=Sun">Sun</a> or <a href="page.php?w=Phobos_%28moon%29">Phobos</a> can be measured by its gravity. This reveals how stiff the interior is, and shows that the core is partially liquid.The study of surface gravity of Mars can therefore yield information about different features and provide beneficial information</p><p>
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