General Discussion
In reply to the discussion: UFOs exist and everyone needs to adjust to that fact [View all]krispos42
(49,445 posts)I said "galaxy". you know, where stars are clustered relatively close together.
Try reading this book; I didn't want to believe the conclusion, but it makes a lot of sense.
https://www.amazon.com/Universe-Teeming-Aliens-WHERE-EVERYBODY/dp/0387955011
The basic tenant is that the extremely old age of the universe means that far more time has elapsed than is necessary for a spacefaring species to spread itself throughout the galaxy, even if it wasn't through direct colonization but through automated starships with embryos on board.
Try as we might, we keep NOT finding any extraterrestrial DNA on our planet. Every animal and plant and microorganism we find has Earth DNA.
There are other arguments as well, such as the configurations of our solar system, the development of speech centers in the brain, and of language. But that is the crux. The universe the author paints is one full of life, but lacking in intelligent life.