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Life beyond EaRTH

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5 sci-fi aliens — and the likelihood they could actually exist

While all cellular life on Earth shares the same DNA-based chemistry, planets with different environments could produce alien organisms far more diverse. From insect-like swarms to intelligent machines, many classic sci-fi alien archetypes have at least some grounding in biology, astrobiology, or emerging technology. Ultimately, truly alien life may defy our expectations altogether, and recognizing it could require rethinking not just what aliens look like, but how we define