Tyyr wrote:It's a question of convergent evolution. Given a similar set of environmental conditions you would expect to see roughly similar looking creatures. For instance fish.
A similar thing could happen with humanoid aliens. The human form is relatively efficent given our conditions.
GrahamKennedy wrote:Not necessarily. Fish share the ocean with many creatures that look nothing at all like fish - from the octopus to the jellyfish and more besides. Evolution can produce similar creatures in similar environments, but there's nothing to say that it must.
GrahamKennedy wrote:Of course, sci fi generally restricts itself to planets that are also very similar to Earth for budget reasons, too. We may find intelligent life evolved in radically different environments elsewhere. Imagine what a being evolved on Venus or the depths of Jupiter might be like.
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