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.
These artifacts would likely entail more than just alien space trash, and would arguably include evidence of alien scientific or industrial activity, such as extremely advanced lunar mining, energy generation; even technology related to lunar nearside Earth reconnaissance.
Or so says Paul Davies, a longtime SETI (Search for Extraterrestial Intelligence) researcher, physicist, and now Director of the Beyond Center at Arizona State University in Tempe.
For the rest of the story: http://www.forbes.com/sites/brucedorminey/2014/07/23/crowdsourcing-the-search-for-alien-artifacts/