Without being idealistic and bias to what appears to be common knowlege, having looked through a telescope myself and seen countless round objects in space it would seem more likely that our planet would be round, and having been in an aeroplane and witnessed the curvature of the landscape, that would suggest the world is round, The idea that nasa are the only people to have a complete monopoly on space to control all images of it seems highly unlikely as there are numerous private company's that own, launch, lease, rent, use satalites that provide images and information, however it is still remotly possible that they do but it would be highly unlikely, the only thing is that from ground level the earth does appear flat, My opinion is i cannot provide evidence that the world is flat or round but i think it is far more likely to be round and belief is not a sufficient justification for anything so what we belive is irrelevent only what i fact or not fact matters if you are a real beliver in flat earth instead of looking for evidentce and what not, purchase a yact or aeroplane and travel to the edge of the planet or around the globe that would prove to your self the answer. Whatever the conclusion of your voyage your view will no longer be based on belief but fact