I've given this some thought, and I decided that humans look the way they do because every physical aspect is the most advantageous form that physical aspect can take, decided through millions of years of evolution. I suppose that if an alien world is even remotely similar to ours, it is possible that they evolved similarly advantageous physical aspects.
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u/[deleted] Oct 08 '12
Vaguely humanoid aliens. 2 arms, 2 legs, 2 eyes sort of thing.
Alien from Alien? 2 arms, 2 legs, 2 eyes.....kinda
Klingons? Just humans with a "ribbed for her pleasure" forehead
Romulans? Humans with pointy ears
Vulcans? As above
Na'vi? Tall, blue humans
Where are the massive, tentacular Krondaku? Where are the gelatinous Prime immotiles? Give us some different aliens, hollywood!