One scientist has proposed a possible new explanation for why we have yet to encounter intelligent alien life. The question of whether we are alone in the universe remains one of the biggest philosophical conundrums of our time. While it seems almost inconceivable that our civilization is alone in the cosmos, the fact still remains that we have yet to see any evidence to the contrary. The Fermi paradox, which highlights the contradiction between the likely existence of extraterrestrial civilizations and the fact that we have still never encountered any, seems to suggest that either there are no aliens out there, or they are so rare that it is unlikely we would ever come across them. But what if there was another explanation ? According to astrophysicist Zaza Osmanov from the Free University of Tbilisi in Georgia, the answer could actually be incredibly simple - what if alien probes were so small that we can't see them ? There seems to be an unwritten assumption that any