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Originally posted by Dr X
I think aliens that developed in high gravity would have to be bigger and stronger than us to move around. I think the smaller species might come from planets with lower gravity than Earth.
Mind you when Major Corso discusses the dissection of the grey aliens he says they have very lightweight bones that are very strong as if they were designed or evolved to resist very high g forces in spaceflight.
There are reports of giant races as well as smaller ones.
Originally posted by Beachcoma
There's one possibility I can think of for this. Perhaps they've continued their evolution in space. Low gravity would explain the neck, low light would explain those massive eyes.