Alien Artifacts On The Moon?

Alien Artifacts On The Moon?: "As nutty as it may seem to the uninitiated, the notion of looking for alien artifacts on our own Moon may finally be gaining mainstream scientific traction. There are good reasons to seriously consider the possibility that at some point in the Earth-Moon system’s storied 4.5 billion year-old history, an alien intelligence may have passed through our solar system; leaving physical artifacts of their visits."