This is a tough one for a scientist. As yet there is no evidence (and my favourite two words in science are: “Prove it”) BUT….
The universe is a big place – do I believe life could originate elsewhere? Yes, but not as we know it and almost certainly not as a little gray man.
Science itself doesn’t know yet if there are aliens. Personally, I think it is very unlikely for a universe this big to not have any other life, but some people would disagree with me!
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