Why we may not be visited by beings from another planet

In my last article on UFOs, I talked about the Extra-Terrestrial UFO Hypothesis. According to this hypothesis, unidentified flying objects are often attributed to craft piloted by beings from another planet when no other explanation is found. This is similar to how mundane but unexplained bumps in the night are attributed to ghosts by some people. In this article, I will endeavour to present an argument that makes the ET hypothesis less likely, due to the many prerequisites that need to occur before life can develop complexity to a point where interstellar travel is possible.



