The NASA GRAIL probes, otherwise known as the Gravity Recovery and Interior Laboratory, will measure the moon's gravity and interior distribution of matter, unveiling crucial details on its general structure. This map charts this very distribution with its variations in color and small to medium-sized circles.
Red shading is indicative of greater mass while blue represents a lesser buildup. The information has been assembled and color coated in accordance with the Ebb and Flow satellites which were put into space during the GRAIL launch.
The sheer absence of atmosphere makes this data all the more accurate. Members of the GRAIL team are able to amass detailed and best of all reliable data, all of which was collected with large microwaves.