It's very simple. All the images from space are fake. They come from NASA, and everything from NASA is fake (as Cup of Ruin says) . There is NO physical evidence that the world is round. It cannot be proven. The curvature at the horizon is an optical illusion - you see it because you expect it to be there since you are taught from an early age this lie of satan from the pits of hell that the earth is round. Any supposed "curvature" of the earth is only visible from altitudes of 20 km and above at which heights the lack of oxygen and atomic particles from space impacting the human brain leads to delirium and the testimonies of those who have seen the supposd "roundness" of the earth from these heights is unreliable.
A picture which shows how the earthly probably looks (although no one has travelled underneath) is found here:
http://www.freewebs.com/raacoz/enclosure3[1]4.jpg
And a lot of evidence for this theory of a flat earth found here (such as no curvature on the lake of Michigan,
No curvature across the Strait of Gibraltar, no curvature all the way to Morocco.)
http://theflatearthsociety.net/forum/index.php?topic=1183.0