This is a polar stereographic map of gravity of the north polar region of the moon from the Gravity Recovery and Interior Laboratory (GRAIL) mission. The map displays the region from latitude 60 north to the pole. The data was collected during GRAIL's extended mission which took place from Aug. 30 to Dec. 17, 2012. In the image, red corresponds to mass excesses and blue and purple to mass deficiencies.
NASA's Jet Propulsion Laboratory in Pasadena, Calif., manages the GRAIL mission for NASA's Science Mission Directorate in Washington. The Massachusetts Institute of Technology, Cambridge, is home to the mission's principal investigator, Maria Zuber. GRAIL is part of the Discovery Program managed at NASA's Marshall Space Flight Center in Huntsville, Ala. Lockheed Martin Space Systems in Denver built the spacecraft. The California Institute of Technology in Pasadena manages JPL for NASA.
For more information about GRAIL, please visit http://grail.nasa.gov.