Ok well, while this overvation has no proof or anything like that, and therefor nothing that alows me to directly counter it i can put down some data.
One thing that would allow you to se more of and object that would be ectected useing strait lines is that light does not travel in straight lines. Light, which is made up of photons, can go through any number of distortions. For example, it can refract. Notice how when you put a strait stick into water it apears to bend, this can happen with water vapour, on a much smaller scale of course. Also, the mass of the earth causes a bending in space time, which the light particles must move through because they are not traveling faster than the speed of light. This beding is bery limited on earth, but explains why you are able to see the surface of the earth far into the distance, instead of looking along a tangent line. The limit of this bending is reached when the central mass is great enough to cause the curvature of space-time to be so great that the light bends back in a loop of limited height, however this only happens in select cases and creates what is known as a blach hole.
I could cite sources but you said earlier that you thought all of the scientist were in on a conspiracy, so that would be sort of useless wouldn't it?