Comment Re:And the scientific evidence for this conclusion (Score 1) 391
Those clearly aren't life forms. Otherwise we might as well just declare the hydrogen atom the dominant form of life in the universe.
And anyway the bacteria that most likely accompanied Curiosity to Mars outnumber the robots on Mars. Of course they might not have survived the trip and would be dormant (though that's more alive than a rover.)
Microorganisms dominate Earth. It's all ridiculous "make shit up" speculation, but it seems reasonable that microorganisms would dominate other places that have life. Obviously its not proof, but you only asked for evidence. microorgnisms dominate known life in the Universe, surely the burden for evidence is on those claiming that the rest of the universe is different than the bit we have observed.
If you are talking about intelligent life engaging in interstellar space travel then sure, computer brains are more likely than biological life assuming our current understanding of physics is vaguely similar to reality but that's a different thing than the "dominant form of life in the Universe".