In “The UFO Question (Part 1): NASA, Harvard, and the Pentagon are all taking UFOs seriously now,” we discussed new initiatives aimed at studying the possibility of extra-terrestrial life, as well as new investigations pertaining to UFOs mounted, often in secret, by governmental agencies.

Then, in “The UFO Question (Part 2): The Drake Equation and the Fermi Paradox,” we compared Drake’s estimates regarding the number of alien civilizations that could be expected to develop within our own galaxy to Fermi’s assertion that we’re likely alone because we have yet to hear or see any other forms of intelligent life.

Most recently, in “The UFO Question (Part 3): If aliens are out there, why can’t we hear them?” we addressed the two suppositions our search for alien life has thus far been based on: that a galaxy lousy with alien life would result in evidence we’re able to detect and that aliens capable of traveling through the massive expanse of space would be interested in meeting us. We then addressed the issues with the first of those two suppositions.

The second supposition our hunt for alien life has been based on that we’re addressing is the idea that aliens would engage with us if they saw us. Unfortunately, this one is equally as baseless in science. Here on earth, we coexist with literally millions of other species and, to date, we haven’t been able to effectively communicate with any of them.