I personally think it would be ridiculous to believe in the whole vast universe we are the only life.
I am not convinced whatsoever because I have a data point of 1, our world. Therefore I'm completely agnostic on the matter and that seems to be the only valid scientific approach. I would be more inclined to believe that any "extraterrestrial" beings are in fact terrestrial in origin, but so far advanced in intellectual evolution as to be qualitatively different, and therefore it is possible in this given scenario that they have found ways of moving through time and/or space in ways our limited intelligences may not even in principle begin to understand. Fantastic? Certainly and I don't propose it as reality, however it does have an advantage over "aliens" and that is it uses the one known case of life in the universe. It also provides a solution to the Fermi Paradox. Unless the necessary AI and technological advances are fundamentally impossible, we should be able to create a von neumann probe which would self replicate. Sagan proposed a rather weak objection to them, but the complexities of making such a device are far greater than any imaginable difficulties in regulating replication. That leads to either he disquieting notion that technological civilizations wipe themselves out before reaching the required capability, that we are alone, or that such civilizations are so rare that they we might as well be alone. There's other scenarios I can imagine, but these seem to be the ones which are most widely accepted.
So as Fermi before us asked, "If They exist, where are They?"
Just something for discussion.
Who can say?
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