Surface of the Moon. Optical image of the moon during the last quarter phase, showing the lunar terminator - the division between the illuminated and dark parts of the Moon - and the Copernicus crater (centre). The very pale colours of the lunar surface (slightly enhanced here) are real and represent the various types of iron and mineral deposits. The blue hues reveal titanium-rich areas, while brown-orange and purple colours show areas poor in titanium and iron.