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Maybe there are and they're too far away to notice. Maybe there are and the technology they use is unrecognizable and/or undetectable to us. Maybe there are, but the attributes of life they exhibit aren't what we'd recognize as "alive." Maybe there are, but their metabolic structure is so different they don't give off biomarkers we'd recognize, such as creating oxygen or co2 during respiration. Maybe there are, and they're just very, very, shy. :)Why are there no aliens?