Alien probes could be hiding among us in plain sight as we search for them in the wrong places.

This is the theory of professor Alex Ellery of Carleton University who argues that if self-replicating alien probes have reached our solar system they may not be in the form of flying saucers or flashing lights but camouflaged as rocks from asteroids, lunar debris or comets.

“I believe that extraterrestrial intelligence (in AI form) could be concealed under the lunar surface, in effect, ‘hibernating.’ They may periodically surface to observe our planet and its biological evolution. As that evolution becomes more interesting, their awakening periods may become more frequent but our species evolved very rapidly to become tool-using over the last 2 million years or so,” Ellery told Newsweek .

See Full Page