People tend to think of humans as the pinnacle of evolution, as the be-all and end-all of all organisms. This is just chauvinism.
Let's put it another way: Anatomically modern humans have existed for around 200,000 years. Tyrannosaurus Rex was around for about a million years prior to extinction. Five times as long.
Remember that T. Rex and humans have a common ancestor that set in the basic body pattern of four limbs we still have from lobe fish and bifurcated and cephalised we still have from flatworms. And even with this common ancestor a single species of dinosaur outlived us fivefold.
There is no reason to believe that an alien would be human shaped. An intelligent alien species would evolve under its own set of selection pressures.
Let's put it another way: Anatomically modern humans have existed for around 200,000 years. Tyrannosaurus Rex was around for about a million years prior to extinction. Five times as long.
Remember that T. Rex and humans have a common ancestor that set in the basic body pattern of four limbs we still have from lobe fish and bifurcated and cephalised we still have from flatworms. And even with this common ancestor a single species of dinosaur outlived us fivefold.
There is no reason to believe that an alien would be human shaped. An intelligent alien species would evolve under its own set of selection pressures.
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