and to starrfire, you really are funny you know that? sure gravity would change the appearance slightly and so would the closeness of the sun. so sure they could be bigger or smaller or different colors but their organ systems, nervous system, ect would be very similar. what you fail to realize is just how perfect the human body is. science is amazed at how intricate each system we have is. i was just watching the Science channel the other day and they were talking about the earth and universe and just how perfect everything was to be able to sustain life. they were talking about how earth could not sustain life if we had no moon. come on now guys, its not that hard. just actually think for a second and quit coming up with excuses or arguements cuz your a rebelious being.