Given that there isn’t any evidence for extraterrestrial civilizations:
The answers may be out there, but we must remember the most conservative possibility of all. In all the Universe, until we have evidence to the contrary, the only example of life might be us. Ethan Siegel, “What If It’s Just Us?” at Forbes
He goes through the usual potted history of life on Earth, omitting (they always do) to notice that the human mind is a quite different sort of development than, say, sexual reproduction or flight. It;s the mind that prompts us to even ask questions about ET, yet no one has any idea what consciousness even is.
We’ll see what happens. Most people in his position go back to inventing the space aliens again.
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See also: Tales of an invented god
What great physicists have said about immateriality and consciousness