The most detailed map of Mars' gravity has been released, using the planet's gravity to indicate contours and curves on the surface.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/nasa-most-detailed-map-mars-gravity-helps-solve-red-planet-mysteries
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-business-times
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/space-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nasa
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/planets