By jorgebgt on Skatehive
Extinctions, bottlenecks and filters. https://cdn.steemitimages.com/DQmTMPwVbTYuM5uk27sDp65LFqWf9gzqJQFxC5sATwKUUmB/image.png There must be civilizations less advanced than us, obviously, but a civilization less advanced than us, in the first place, would not be emitting radio signals. We have been emitting them recently, nor could it capture our signals, which means we cannot communicate with them. Obviously there will have to be many and they will surely decrease with the passage of time. What am I referring to? The issue of filters. We are here after having passed a significant number, because recently a new very old mass extinction was published from about 500 million years ago, but we are the survivors of a series of mass extinctions and then also humanity itself went through a series of critical moments, bottlenecks, some due to natural catastrophes such as the eruption of Tonga, about 60,000 years ago, others due to plagues, others mysterious like the bottleneck of almost a mill