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The far side of the Moon is colored in blues, purples, greens, yellows and reds. Blue and purple, indicating lower elevations, are centered in a rough oval in the middle of the far side. This is the location of the South Pole-Aitken Basin. Craters are blue surrounded by green, yellow is scattered around the image, and red is mostly located in the upper area of the Moon. A dotted circle roughly in the center of the South Pole-Aitken Basin shows the location of the mysterious mass.

south-pole-aitken-basin-annotated

A dotted line shows the location of the dense mass in the South Pole-Aitken Basin. In this topographical map, blue indicates low elevations and red indicates the highest elevations.

Image Credit: Image: NASA/GSFC/University of Arizona; Annotations: P James (Baylor University)
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