Here is the real question... If life exists on other planets, and planets have huge differences in atmospheric pressures, just as living on earth and living at the deepest point of the ocean would, how would that life from space ever be able to visit earth- and vice versa.
Or another one while I'm baked n deep'n thought, Currently our technology does not allow us to see very far into space (in comparison...) but the largest planet currently known is called TRES4. Now lets generalize that a human is 5.5' tall, and earth is 12,742 km in diameter. The planet TRES4 is 243,073 km in diameter. If there is humanoid life on that planet, would they be 110 feet tall?
And also, why are 99 of 100 races shown on Star Trek humanoid?
Now I've gone overboard...