What could Chang'e 4 discover on far side of the moon?

Chang'e 4 will test soil composition, try to grow plants, and listen for traces of Big Bang

When we look up at the full moon, we only ever see one face: the "man in the moon" is always gazing back at us. Scientists believe that the far side, eternally hidden from view, may hold the key to fundamental mysteries about the moon's formation and its earliest history.

China's Chang'e 4 mission could reveal new clues to the cataclysmic collision that created the moon and uncover the origins of the water that is unexpectedly abundant in lunar soil.