SETI to Scour the Moon for Alien Footprints?
http://news.discovery.com/space/seti-to-scour-the-moon-for-alien-tech-111227.html
Of course, it is a long shot, as the article states:
If these hypothetical aliens are advanced enough to traverse the vast distances between the stars, and if they decided to pay the Earth-moon system a visit over the past few million years, they may have used the lunar surface as an ideal observation post.
Still, why not look? It isn’t quite like looking under the lamp because that is where the light is, but if there were any visitors that spent any significant time here, it is quite likely they would have checked out the moon as it is quite unusual based on what information astronomers have on moons around other planets.
