By Gregory H. Revera (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons
Our moon has two very different faces: the near side and the far side are quite different from one another. Today, Slate's Phil Plate covers two hypotheses on just why the two sides of our moon are so different. Definitely check out Plate's quick synopsis of the two hypotheses, and if you are hungry for more, dive in to the two resources he covers!
Hypothesis one comes from Nature:
Jutzi, M., & Asphaug, E. (2011). Forming the lunar farside highlands by accretion of a companion moon. Nature, 476(7358), 69-72. http://www.nature.com/nature/journal/v476/n7358/abs/nature10289.html
Hypothesis two you'll find via arxiv.org:If you have any trouble accessing either of these two resources, feel free to ask a librarian! We are happy to help you figure out how to get access to all sorts of resources.
Roy, A., Wright, J. T., & Sigurðsson, S. (2014). Earthshine on a Young Moon: Explaining the Lunar Farside Highlands. The Astrophysical Journal Letters, 788(2), L42. http://arxiv.org/pdf/1406.2020.pdf