This false-color image of the Van de Graaff crater shows an interesting figure-8 shape. It is on the far side of the moon, north of the South Pole-Aitken Basin. The crater looks as if it were created by two separate impacts. However, NASA notes that no crater wall separates the two halves. The area also has a higher concentration of radioactive materials. Another mystery of this lunar area is that it contains a small, localized magnetic field, possibly due to the presence of volcanic rock under its surface. Unlike Earth, the moon does not have a global magnetic field.