I have a theory (probably not original) which I call the “independence Day” theory to explain why we have not discuvered alien life. There may be a hunter-type alien that just lurks until it picks up emissions that signal intelligent life. It then swarms the people who sent the signal and destroys them. If and when SETI discovers a more effective way to transmit intelligent signals, you KNOW that no one will have the discipline to NOT broadcast, even though it is likely that those receiving the signal are far more advanced than us. Alien life could sprout up all over the universe, but once they get to the point where they can broadcast in space, they get gobbled up.
Your theory is probably valid. The issue for all space life theories is the distance between places and the time it would take to get from one place to the next.
Until you can bend space, it’s just yapping around the fire pit.
Why wouldn’t they sterilize a planet before technology emerged?
Good thing we have Will Smith...
I also have a theory about alien intelligent life. (1) We evolved intelligence because it helped us solve problems unique to our environment on Earth. A radically different environment would present different evolutionary pressures and lead to the emergence of a different type of intelligence. Such an entity could be sufficiently different that we would not recognize it as intelligent or perhaps even being alive. In other words, we might meet ET and not even know it. (2) A sufficiently advanced civilization would communicate and travel by means we cannot yet even imagine, much less know to look for. It would be like our ancestors who had no knowledge of radio waves or lasers looking into space for semaphores or smoke signals.
We have been transmitting EM signals for 100 years. There are 100 light years from Earth. If we contacted anyone at the 50 light year mark they will be here any day now.
“I have a theory”
They should make a movie about that.
The earth sends a 50/60 hz tone 12 hours at 50 cycles per second and 12 hours of 60 cycles. This is caused by the power grids in Europe and the americas. Their power is 50hz, ours 60 hz.
This signal is 50 times brighter than the sun. We have already transmitted to ET over the last 10 decades. Too late to hide now...