Take one look at the horizon and you'll see what we see. When you look at the horizon do you see the trees in China. How about do you see the mountains in the next state? Do you think there is just some kind of draw distance on the earth? Or is it that things just "disappear" when they are out of view? because they do and its called the curve of the earth. The horizon isn't a flat line you fool, its the curved edge of a sphere you dingus.