a flat earth simply could not hold together and would not obey the natural laws of physics.
This is just talking from the top of your head. How do you know? You have absolutely no frame of reference at all. How do you know what it takes to hold a planet together? Have you tried to heap a crumbling planet together? You are stood on this intact one. On a flattish bit. As am I. As is everyone. Because its flattish. If the earth is flat, the natural laws are doing a pretty good job of holding it together, and the theory isn't right.
my study of astrophysics.
Its funny we never get anyone with just a high school education. You will be delighted to meet all the astronauts, NASA agents and Antarctic researchers we get here. 
Anyway, you questions all revolve around Conspiracy theory. You ask a great many, so rather than me regurgitate a question that has been answered many many many times before, allow me to link you to the answer.
http://www.theflatearthsociety.org/forum/index.php?topic=6308.msg71968#msg71968
Oh, and welcome to FES. 
firstly, thank you for your welcome
i have a very good frame of reference in my studies of the solar system, which i have observed with my own eyes through some very powerful telescopes.
i would like to understand your frame of reference for proving the earth is flat, to disprove the evidence i have to prove otherwise.
secondly i have already read through that link and like i say it does not answer the question of why? it sort of does but doesn't
now i understand the concept of getting the NASA budget, but how much would be left after all the people who work there get paid. and secondly NASA hasn't been a round for all that long and people have calculated the curvature of the earth long before any space flight ? ok they may be now taking the budget of NASA but what about before that ?
lastly like i said the hundreds if not thousands of books and publications out there by hundreds of thousands of different people all agreeing on the roundness of the earth. all agreeing on the laws of physics, all agreeing on gravity. are you claiming all these people, recognised intelligent people, are wrong? or have been paid to do this ? I have spent years studying this, spoke to countless experts.
All i want is proof, not conspiracy not words. PROOF i am very open minded and will listen to anything anyone has to say. but i do ask everyone remains polite.
just had a thought, what a bout independent space pioneers, like those from the X prize, and independent satalite missions ?