The Fermi Paradox is the apparent contradiction between some of the high probability estimates of the existence of extraterrestrial civilization, and the utter lack of any evidence of such civilizations. There are billions of stars in our galaxy alone, and the universe has been around for a very long time, meaning there would have to be many potential worlds to develop life. Some may develop intelligent life, and some of that life could potentially create interstellar travel. Due to the sheer number of possible worlds where this could happen, why haven’t we been contacted by anyone? There have been many proposed answers to this question, some of which are organized in the flowchart below. Whatever the truth is, all that we know for sure is that if anything else IS out there, it’s staying quiet for now.