A multi-planet species would most likely have developed a method of communication that is not radio or laser based. Meaning they would have figured out a way to communicate outside or EM radiation and the limits of the speed of light. <br><br>If they could travel to other star systems and then colonized them. It would have to mean that they also figured out a way to more rapidly communicate with their ships and colonies. As such, with our current technology. We are trying to eves drop on a form of communication that may have only been used by the ET civilization for a relatively brief period of time in its history. As such we can’t hear them because we don’t have the ability to hear them, yet. <br><br>I think logically, that is the solution to the Fermi Paradox. However, I think the humans species time is coming soon. Not 25 years ago did we even have the ability to detect exo planets. Now we can find them by the thousands. With the James Webb Space Telescope. We will find things out there that we could not have imagined. The same as when we launched Hubble.