We should not expect aliens to look anything like us. Creatures that resemble octopuses or birds or even robots are legitimate possibilities. Key TakeawaysLife is incredibly diverse, spanning from microscopic organisms to skyscraper-sized trees. Alien life would be just as diverse.There is little reason to believe that aliens would take on human-like forms. Perhaps an octopus- or bird-like creature is more likely.Because all lifeforms want to live as long as possible, the most advanced aliens might be fully mechanized robots.

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