The existence of a race of sentient alien robots might be not just possible, but inevitable. In fact, we might be living in a "postbiological universe" right now, in which intelligent extraterrestrials somewhere have exchanged organic brains for artificial ones. The driving factor is a pragmatic desire to improve mental capacity. Alien beings may have already reached a point in their evolution where, having exhausted the potential of their biological brains, they have taken the next logical step and opted for robotic brains equipped with artificial intelligence.
I don't think this is as "out there" as some people might think. When your getting older and your body is failing you, you might make a digital copy of yourself. You could be stored in a secure facility that is powered by renewable energy in a realitively safe area. Then you would be able to interact with the world and your loved ones using a remote robot body that you control over a wireless network like a puppet. It could extend your life by a factor of 10 or more. It massively simplifies space exploration. No life support or other concerns. Just power and electronics shielding. Digital pioneers could do most of the work of opening up somewhere like Mars and younger people with bodies could come along after basic infrastructures have already been developed. Human intelligence with machine durability. As long as renewable power is developed and some form of paid work is done (replacement parts.) I don't see a conflict over resources with the biologic portion of the population. Imagine doctors, scientists, and engineers with 300+ years of experience to consult!!
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