NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Lunar thorium deposits. Coloured maps showing the distribution of the heavy element thorium (Th) in the lunar soil. The Moon's near side is at left, with the north pole at its top. The far side, with the south pole at its bottom, is at right. White and yellow regions represent a large amount of thorium, with dark red and purple areas indicating a relative lack of the element. Thorium is more abundant in the "lunar seas", the dark regions on the Moon's surface as seen from Earth, bounded by white lines here. The seas are made of solidified lava from deep within the Moon. These images were created using data from the Gamma Ray Spectrometer on the Moon-orbiting Lunar Prospector spacecraft.
Model release not required. Property release not required.