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Yes they do exist.
If we are the only species in the vast universe which has developed into sentient beings then we are amazingly lucky
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Yes, we are amazingly, insanely lucky. The odds of a planet being just the right distance from a star, and being capable of supporting life is almost insurmountable. The odds of it happening twice? Twice as insurmountable. It doesn't mean that it didn't happen but it is very unlikely.