🚨SETI: What If the Last Evidence of an Alien Civilization Is Dust? A new paper from Breakthrough Listen researcher Brian C. Lacki asks a fascinating question, what evidence would remain if a technologically advanced civilization disappeared millions or even billions of years before humanity began looking for it? The problem with the traditional search for extraterrestrial intelligence is that civilizations may be separated by time as much as distance. Humanity has only been transmitting radi...