We don't talk enough about the moon always facing us. It blows my mind to think that month after month for milennia, the moon has continuously faced us in this exact same direction. It rotates at the exact same speed it revolves, and it doesn't alter its axis. The same picture in full display every 28 days.

My theory, at least my least harebrained and most reasonable theory, is that the part of the moon that faces us is denser than the part that doesn't face us, and as a result gravity keeps it pulled towards Earth.

Thoughts.???