From Penn State -- The Man in the Moon appeared when meteoroids struck the Earth-facing side of the moon creating large flat seas of basalt that we see as dark areas called maria. But no "face" exists on farside of the moon and now, astrophysicists think they know why. This mystery is called the Lunar Farside Highlands Problem and dates back to 1959, when the Soviet spacecraft Luna 3 transmitted the first images of the "dark" side of the moon back to Earth.
There is much excitement in the space science community, with the successful landing of the Chang’E 3 spacecraft, carrying the Yutu (Jade Rabbit) surface rover on December 14. These websites (in English) contain images, video, and some of the earliest data from the rover.
A new theory suggests that, after 80 million years of co-existing, a slow collision between our current Moon and a smaller, second Moon occurred. Is this how the mountains on the far side of the Moon formed?