The evidence on Earth points to exactly the opposite conclusion. Earth had independent experiments in evolution thanks to continental drift. New Zealand, Madagascar, India, South America… half a dozen experiments over 10, 20, 50, even 100 million years of independent evolution did not produce anything that was more human-like than when it started. So it’s a silly idea to think that species will evolve toward us.
“If you go to these other continents and ask zoologists,” observed Australian astrobiologist Charles Lineweaver, “What do you think is the smartest thing there? Is it trying to become human? Is it any closer today than it was 50 million years ago to building a radio telescope? I think the answer would be no. If that’s the answer, then there is no trend toward human-like intelligence, and this whole idea of intelligence being convergent is just an empty claim based on what we want to believe about ourselves. Only one species of the billions of species that have existed on Earth has shown an aptitude for radios and even we failed to build one during the first 99% of our 7 million year history.”
Current estimates say that are some 100 billion stars just in our Milky Way galaxy and 10 billion trillion stars in the observable universe.There are more stars in existence than days since the universe was formed.Yet, the deafening silence from space is not surprising. There must be other radio transmitters out there, but perhaps none in our galaxy. If homo sapiens survive long enough, time will tell.
We should not expect to see any other forms of life that are genetically, functionally and intellectually similar to us.” Lineweaver emphasizes. “I strongly suspect that our closest relatives in the universe are here on Earth, and they’re not likely to be elsewhere.”