I think intelligent life other than humans exists. The universe is huge and it's impossible for other life forms not to exist. But because the universe is so big it's unlikely that other beings will be able to find us. Unless they've developed sophisticated technology that allows them to detect life and travel faster than the speed of light (through wormholes or something) they most likely will never find Earth. If they have that technology already, why would they bother visiting our small unassuming planet?
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