The Moon is mysterious. We can gaze upon it every night, yet still be so far from uncovering its secrets. This week, new studies were published detailing new theories about the Moon's origin and evolution. The Earth and Moon may have more in common than scientists originally thought. Moon rocks have a composition which is similar to that of our own planet. Scientists have developed two theories, the "great impact hypothesis" and the "late veneer" hypothesis which describe how the Earth and Moon were formed.